Zoologisclier Anzeiger 



herausgegeben 



von Prof. Eugen Korscheit in Marburg. 

 Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Bibliographia zoologica 

 bearbeitet von Dr. H. U. Field (Concilium bibliographicum) in Zürich. 



Verlag von Wilhelm Engelmann in Leipzig. 



XXVIII. Band. 25. April 1905. Nr. 23. 



Inbnlt: 



I. wissenschaftliche Mitteilungen. •>■ I^öuuberff, Pelagische von der schwedischen 



!. Wooaian.1, (in a New M.Kle of Persistence of ! Sudpolar -Expedition r.i01-lil03 erhentete 



the Posterior Cardinal Vein in the Frog {Raun 



Fische. S. 762. 



tcmporaria): With a Suggestion as to the fî- Corti, Eriofldi nuovi o poco noti. (Con 2 fig.l 



Phylogenetic Origin of the Post-Caval Vein. S. 706. 



(With 5 figures.) S 737. I ,, „... ., ,, , ... , 



^ I II. Slitteilnngen aus Unseen, Instituten nsn. 

 2. >o.ack, Bären aus der Mongolei. S. 74S. 



:i. Noack, Analyse der Herb erstainschen Ab- 

 bildungen des Ur und des Wisent (Mit 

 2 Figuren.) S. 749. 



4. Saiut-Hilaire, Snr l'organe phagocytaire des 

 Crustacés Décapodes. S. 760. 



1. Plöuer ForscUnuifsbcriclite. S. 773. 



2. Deutsche Zoologische Gesellscliaft. S. 774. 



III. Personal-Notizen. 



Nekrolog. S. 776. 



I. Wissenschaftliche Mitteilungen. 



1. On a New Mode of Persistence of the Posterior Cardinal Vein in the 



Frog (Rana temporaria): With a Suggestion as to the Phylogenetic Origin 



of the Post-Caval Vein. 



By AV. Woodland, university College, London. 

 (With 5 figures.) 



eingeg. 23. Februar 1905. 



Part I. 



The abnormality referred to in the above heading was found in a 

 male frog which was undergoing dissection during class-work at the 

 London Hospital Medical College. It is of more than usual interest 

 since only three similar variations have hitherto been described, from 

 all of which it differs considerably, and moreover it is perhaps of some 

 importance since, essentially consisting as it does of the disappearance 

 of the post-caval vein and its replacement by a persistent right posterior 

 cardinal, it possesses on this account a phylogenetic significance. 



The persistent posterior cardinal, which forms the most conspicuous 

 feature in the abnormality, is, as shown in the accompanying figure, a 



52 



