摘要:

On a étudié une collection d'Oligochtès réalisee par le dr. Lindberg en Afghanistan. Cette collection comprenait une espècc indéterminablc de lumbrieulidés et sept espèccs de lumbricidés toutes déjà connues.

ISSN:0373-4137    

DOI:10.1080/11250005909438299

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

L'A. déerit les mitochondrics, les granulations acidophiles ct basophiles qui se trouvent dans les cellules du corps blane des Mollusqucs Ccphalopodes, ct il montre qu'il y- a des differences entreSepia officinalisetOctopus vulgaris. En particulier, dans les mitochondrics, l'A. a observé une ultrastructure donnée par des tubules, qui dérivent de la lamine interne de la membrane externe.

ISSN:0373-4137    

DOI:10.1080/11250005909438300

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

A cytological investigation of androgcnctic hybridsAscidia malaca(♀) ×Phallusia mamillala♂ has demonstrated that all of them contain only chromosomes ofPhallusia, in the haploid number. The embryos which developed to swimming tadpoles (11 out of 218 eggs) showed normal differentiation and organization. On the other hand, the embryos whose development stopped at the blastula stage (140 out of 218 eggs) showed neither morphogenetic movements nor differentiation, and revealed an almost complete blocking of their mitotic activity.

ISSN:0373-4137    

DOI:10.1080/11250005909438301

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Verfassers bescbreiben die Zellarten des Vordelappens dcr Hypopbyse des Kalers; Sie IIabcn die α, β, γ, δ, ε und Slamm-Zellen gefunden.

ISSN:0373-4137    

DOI:10.1080/11250005909438302

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The Author with this note considers the characters of n fourth species of the genusOithona, viz.Oithona spinirostrisfrom the channel of Messina. Also for this species he demonstrates that the male ascribed toOithona spinirostrisbelongs to another species.

ISSN:0373-4137    

DOI:10.1080/11250005909438303

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The Author, in addition to the previous researches on the genus Oithona of the channel of Messina, studiesOithona helgolandicaand concludes thatOithona similismust be considered as synonym of the species by him studied. He demonstrates that the specimen hitherto described as male ofOithona helgolandicabelongs to another species for it presents notable morphological differences as to the female. In the gatherings of Messina the A. finds together mature females, some of which bringing attached the two spermatophorcs, a number of males, whose morphological characters agree perfectly with those of females, except for the genital segment and for the fusion of the fourt and fifth abdominal segment, instead of the first and the second, characteristic of the females.

ISSN:0373-4137    

DOI:10.1080/11250005909438304

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The A. studiesOithona setigeraof the channel of Messina and concludes that the above - described species represents the type, whereasO. challengcriBrady (1883),O. tropicaWolfenden (1905), andO. pelagicaFarran (1908) ought to be considered as synonyms.Oithona linearisGiesbrecht (1892) exhibits indeed such characters that it is possible to establish a simple variety.

ISSN:0373-4137    

DOI:10.1080/11250005909438305

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The A., concluding his researches on the genusOithonaof the channel of Messina, calls attention to the lack of a true sexual dimorphism and herewith to the different systematical position.

ISSN:0373-4137    

DOI:10.1080/11250005909438306

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor