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  • Cambridge University Press (CUP)  (638)
  • 1935-1939  (638)
  • Biology  (638)
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  • Cambridge University Press (CUP)  (638)
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Language
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  • 1935-1939  (638)
Year
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Subjects(RVK)
  • Biology  (638)
RVK
  • 1
    Online Resource
    Online Resource
    Four species of Hymenolepis Weinl. parasitic in the oystercatcher, Haematopus ostralegus Linn
    Cambridge University Press (CUP) ; 1939
    In:  Parasitology Vol. 31, No. 4 ( 1939-12), p. 401-412
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 31, No. 4 ( 1939-12), p. 401-412
    Abstract: The material for the present investigation was obtained from nine oystercatchers shot on the coast of Cardigan and one shot at Peterstone on the coast of Monmouth; for the material from the latter bird the writer is indebted to Mr Thomas Walker, M.Sc., of University College, Cardiff.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000012907
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1939
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    On four new species of cercariae. A contribution to Sewell's evolutionary scheme
    Cambridge University Press (CUP) ; 1939
    In:  Parasitology Vol. 31, No. 3 ( 1939-09), p. 285-298
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 31, No. 3 ( 1939-09), p. 285-298
    Abstract: 1. Two new species of Xiphidiocercariae have been described. These two forms have been designated as C. lühei and C. gopyjungi . 2. The flame-cell formula of C. lühei is 2 × 3 × 3 = 18 and that of C. gopyjungi is 2 × 4 × 3 = 24. 3. It is shown that C. gopyjungi has the characters of both the subgroups Polyadena (Cort) and Daswan (Sewell), and the group Cercariae armatae is redefined. 4. Further, two new species of furcocercous cercariae have been described. They have been designated as C. ajmeri and C. anasagari. 5. It has been pointed out that the types of excretory systems as met with in C. ajmeri and C. anasagari are of extreme importance from the evolutionary point of view and fill in gaps in Sewell's (1930) evolutionary scheme. 6. The latter two species have been listed in their proper position in Miller's (1926) scheme of classification of the furcocercous cercariae.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000012853
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1939
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    The generative organs of the blow-fly, Calliphora erythrocephala L., with special reference to their musculature and movements
    Cambridge University Press (CUP) ; 1938
    In:  Parasitology Vol. 30, No. 4 ( 1938-12), p. 441-476
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 30, No. 4 ( 1938-12), p. 441-476
    Abstract: In Part I the musculature of the internal organs of the male blow-fly, C. erythrocephala , testis, vas efferens, accessory gland, vas deferens, and ejaculatory sac and duct, is described, together with the movements observed in them and the passage of secretions down the system. It is suggested that the testicular and accessory gland secretions are ejaculated separately. The musculature, mechanics and co-ordinated movements of the external organs and associated structures are also described. In Part II the generative organs of the female, except the ovaries, with special reference to their musculature and movements, and the musculature of the ovipositor are described and compared with those of M. domestica . It is suggested that the male accessory gland secretion is kept separate from the testicular secretion, the former passing into the lateral sacs of the female and the latter into the spermathecae. In Part III the relation of the parts of the two sexes during coitus is discussed.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000026019
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1938
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    PAR volume 31 issue 2 Cover and Back matter
    Cambridge University Press (CUP) ; 1939
    In:  Parasitology Vol. 31, No. 2 ( 1939-07), p. b1-b1
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 31, No. 2 ( 1939-07), p. b1-b1
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000012695
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1939
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    The antiproteolytic enzyme of Ascaris lumbricoides var. suis
    Cambridge University Press (CUP) ; 1938
    In:  Parasitology Vol. 30, No. 2 ( 1938-06), p. 141-155
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 30, No. 2 ( 1938-06), p. 141-155
    Abstract: 1. The inhibitory effect of Ascaris extract on pepsin and trypsin is confirmed. This inhibition is shown not to occur with papain. 2. The inhibitory effect is shown to be brought about by a combination of the anti-enzyme with the enzyme and not by any of the other possible causes. 3. The extract is shown to have a proteolytic as well as an inhibitory action and these two properties are shown to be due to one and the same substance. 4. The term “ascarase” is suggested for this substance. 5. The ascarase is shown to be a readily diffusible substance of the order of a primary albumose, is precipitated by ammonium sulphate and 70% alcohol, is only slowly destroyed in acid but rapidly in alkali and is not digested by trypsin. It combines with the greatest quantities of substrate at p H 5–7. 6. Ascarase is found in the various tissues of the worm in the following order: ovary, oesophagus, gut, body fluid, ovojector, lateral line, uterus and cuticle. A similar order was found for the male. 7. The results found by de Wael (1933) for T. saginata do not apply to Ascaris. 8. The effect of the ascarase on the host and its function in the worm are discussed.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000025695
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1938
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Fertilization and egg production in the bed-bug, Cimex lectularius L.
    Cambridge University Press (CUP) ; 1939
    In:  Parasitology Vol. 31, No. 2 ( 1939-07), p. 193-199
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 31, No. 2 ( 1939-07), p. 193-199
    Abstract: Previous workers have described the curious method by which the female bed-bug is fertilized. They have suggested that the large quantity of sperm injected serves some function other than that of fertilizing the egg. The rate of metabolism of the virgin bug is much less than that of the fertilized female. Ovarian development never occurs until the female has been fertilized. After fertilization, egg development is apparently controlled by a hormone produced by the corpus allatum. Living sperm will always be found in the spermathecae of females which are laying fertile eggs. The so-called imperfect eggs produced when the sperm is exhausted are normal save for being unfertilized. They have been considered as malformed because of their tendency to shrivel quickly in dry air. Sperm remains viable in the female for a definite period depending on the temperature. This period is longer at low than at high temperature. Provided a certain minimum amount of sperm is introduced (this minimum is less than the quantity introduced by a well-nourished male at one copulation), the period of viability of sperm is the same no matter how many eggs are produced. The number of eggs depends only on the amount of food taken. There is no evidence that the sperm serves any nutritive function in the female.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000012750
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1939
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    A new species of Acanthocephala, Acanthosentis dattai , n.sp., from a fresh-water fish of Bengal, Barbus ticto (Ham. & Buch.) and B. stigma (Cuv. & Val.)
    Cambridge University Press (CUP) ; 1938
    In:  Parasitology Vol. 30, No. 2 ( 1938-06), p. 171-175
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 30, No. 2 ( 1938-06), p. 171-175
    Abstract: About a year ago when examining the intestinal contents of various fresh-water fishes of Bengal, I obtained a new acanthocephalan parasite, Acanthosentis dattai , from the small intestine of Barbus ticto and B. stigma . In a single host as many as twenty were obtained, but the average number of parasites taken from other hosts was four to ten. Some of these were found lying in a sluggish state in the lumen of the intestine. About the months of July and August some were found in copula.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000025725
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1938
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Selenocystis foliata (Ray) from Scolelepis fuliginosa Clpde. and its identity with Haplozoon sp.
    Cambridge University Press (CUP) ; 1938
    In:  Parasitology Vol. 30, No. 3 ( 1938-09), p. 296-308
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 30, No. 3 ( 1938-09), p. 296-308
    Abstract: 1. The so-called parasitic dinoflagellate occurring in the gut of the polychaete worm Scolelepis fuliginosa Clpde. is described and is shown to be the sexual phase of the gregarine “ Selenidium foliatum ” Ray. 2. The gametocytes (often very unequal) associate by their posterior ends while in situ . One remains attached and its epimerite is transformed into a foot-like organ serving to attach the gametocyst to the host throughout the rest of development. The gametocyst is elongate and pyriform (26−226 × 9−34 μ) and its formation involves very little alteration in the shape of the gametocytes. Solitary encystment also occurs. 3. The first gametocytic nuclear division is described. Forerunners of the gamete nuclei are formed within the nuclear area of the gametocyte. Flagellated isogametes are formed. There is no residuum. 4. The spores are spherical, averaging 8·5μ in diameter, the number depending on the size of the cyst enveloping them. When ripe, they contain four or eight spindle-shaped sporozoites 9·4−14 × 2−3·75μ and, in vivo , a central, spherical, refrigent residuum. 5. A new genus Selenocystis is proposed for this organism, with S. foliata (Ray) as the type species. Although I have not found its asexual phase, the probability is that it may still be classified among the schizogregarines.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000025841
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1938
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 9
    Online Resource
    Online Resource
    Field studies on coccidiosis in the ring-neck pheasants of eastern Washington
    Cambridge University Press (CUP) ; 1939
    In:  Parasitology Vol. 31, No. 3 ( 1939-09), p. 389-399
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 31, No. 3 ( 1939-09), p. 389-399
    Abstract: 1. An average incidence of infection of 38 % was found in thirty-seven ring-neck pheasants over a period of 7 months. 2. There was a drop in the incidence from 70 % in October to 30 % in November. The incidence remained at 30 % during February and March and jumped to 67 % in April. 3. Three species of Eimeria were identified: E. phasiani Tyzzer and two new species, E. pacifica and E. megalostomata. A fourth type designated as type IV was seen but not described because of an insufficiency of specimens. 4. All infections observed were light. Histopathological studies showed little damage to the intestine and there was no significant difference between the weights of infected and non-infected birds. 5. Oocysts of E. pacifica sporulated at temperatures from 8 to 30.5° C. The latter is the optimum temperature. Intracellular organization prior to sporulation was indicated in oocysts of E. pacifica kept at 8° C. 6. A temperature of 37.5° C. was lethal to oocysts of E. pacifica. Degenerative changes in the oocysts were first observed 9 days after being placed at that temperature. This work was done in the Zoology laboratory of Washington State College, Pullman, Washington. I wish to acknowledge my indebtedness to Dr R. F. MacLennan, of that Institution, for suggesting the problem, for his help and co-operation in the prosecution of the work, and to Dr F. S. Henika for assistance in the collection of specimens. I also wish to acknowledge my indebtedness to Dr Victor Burke and the Dairy Department for the use of the apparatus. Acknowledgement is also made to the Washington State Department of Game for permission to collect pheasants.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000012877
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1939
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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  • 10
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    Online Resource
    A description of Hymenolepis neoarctica n.nom., syn. H. fusus Linton, 1927, with a discussion on the synonymy of Taenia fusus Krabbe, 1869
    Cambridge University Press (CUP) ; 1938
    In:  Parasitology Vol. 30, No. 3 ( 1938-09), p. 339-343
    Details
    In: Parasitology, Cambridge University Press (CUP), Vol. 30, No. 3 ( 1938-09), p. 339-343
    Abstract: The species of Hymenolepis Weinl. described in the following pages was collected from the small intestine of a greater black-backed gull, Larus marinus , shot on the Dovey mudflats near Aberystwyth, in February 1935. Comparisons of the dimensions of scolex and strobila, measurements of rostellar hooks and suckers, and appearance of genitalia, prove beyond doubt that the species is identical with that described by Linton (1927) under the name of Hymenolepis fusus (Krabbe) (vide Table infra). From the data tabulated in the discussion below, the writer is satisfied moreover that the species described by Linton is totally distinct from Taenia fusus Krabbe 1869, and the new name Hymenolepis neoarctica is therefore proposed to include Linton's species. Since the description by Linton dealt only with the morphology of the immature forms, the following account of the morphology of the mature worm is given, based on material collected at Aberystwyth.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
    URL: Article
    DOI: 10.1017/S0031182000025907
    RVK:
    WA 15000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1938
    detail.hit.zdb_id: 1491287-9
    SSG: 12
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