Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XVm. Jahrg. 25. März 1895. No. 471. 



Inhalt: I. Wissenschaftliche Mittheilnngen. 1. SIclIarrich , The Segmentation of the ovum 

 in terrestrial Isopods. 2. Wasmann, Zur Kenntnis der myrmekophilen Arthropoden. '^. Canestrini, 

 Über einen neuen Parasiten der Sängethiere. 4. Treuenfels , Die Zähne von Myliohates aquila. 

 5. Boettger, Liste der Reptilien und Batrachier der Insel Halmaheira nach den Sammlungen Prof. 

 Dr. W. Kükenthal's. 6. Ostronmoff, Springen oder Fliegen? II. Uittheil. ans Unseen, Institu- 

 ten etc. 1. Meyer, Noch einmal die Wiese'sche Conservierungsflüssigkeit. 2. Zacharias, Statistische 

 Mittheilungen ans der Biologischen Station am Großen Plöner See. 3. Zoological Society of Lon- 

 don. 4. La Société Zoologiqne de France. 5, Deutsche Zoologische Gesellschaft. III. Per- 

 sonal-Notizen. Litteratnr. p. 73 — lOS. 



I. Wissenschaftliche Mittheilungen. 



1. The Segmentation of the ovum in terrestrial Isopods. 



By J. Play fair McMurrich, Ann. Arbor, Mich. 



eingeg. 11. Januar 1895. 



For some time I have been engaged in a study of the early deve- 

 lopment of the Isopod Crustacea, and, during the past summer, com- 

 pletedapaper (to appear in the .Journal of Morphology) containing 

 the results of my observations on the segmentation and formation of 

 the germ layers in a number of different species of Isopods. Since 

 this paper left my hands Professor L. Roule has published an account 

 of his observations on the early development oi Porcellio scaher^ giving 

 in a more extended form and with figures the results previously indi- 

 cated in preliminary notices in the Comptes Rendus. To these preli- 

 minary notices I have referred in my forthcoming paper , but as M. 

 Roule has reiterated in his memoir statements so distinctly at variance 

 with my observations on Porcellio scaler in this country, it seems 

 fitting that attention should be called to certain of the discrepancies, 

 especially since M. Roule's observations tend to perpetuate the, as 

 I have good reason to believe, mistaken ideas of Bobretzky as to 

 the existence of a telolecithal segmentation in terrestrial Isopods. 



' L. Roule, Etudes sur le développement des Crustacés. Ann. des Sciences 

 Nat. Zoologie, VII. Sér. T. XVIIL No. 1—3. 



