Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig, 



XIV. Jahrg. 4. Mai 1891. No. 362. 



Inhalt: I. Wissensch. Mittheilungen. 1. Waters, Some additional points on the Primitive Seg- 

 mentation of the Vertebrate Brain. 2. Herrick, The Development of the American Lobster. (Schluß. ) 

 3. Lebediiisky, Die Entwicklung der Daphnia aus dem Sommereie. 4. Fritsch, Über Schmuckfarben 

 bei Holopedium gibberum Zad. 5. Randolph, The Regeneration of the Tail in Lumbrìcidus. II. Mit- 

 theil, aus M »seen, Instituten etc. Anfrage. III. Personal-Notizen. Vacat. Litteratur. p. 105—120. 



I. Wissenschaftliche Mittheilungen. 



1. Some additional points on the Primitive Segmentation of the 

 Vertebrate Brain. 



By Bertram H. "Waters B.A. , E.M. Fellow in Biology, Princeton College, U. S. A. 



eingeg. 25. März 1891. 



The following is a brief abstract of some investigations, which 

 were undertaken in the Morphological Laboratory, at Princeton, under 

 the direction of Dr. Henry F. Osborn, during the winter of 1889 — 90, 

 pursuant upon those of Mr. C. F. W. McClure, the results of which 

 were published in this journal in number 314, 1889. 



It was intended, by the study of still lower forms than have been 

 investigated by him , to confirm results already obtained and to show 

 that the symmetrical folds or constrictions which have been first shown 

 to exist in the lateral walls of the embryonic hind-brain and which 

 were believed to be remains of a general primitive neural segmentation, 

 extended into and involved the fore and mid-brain also. 



These folds have frequently excited the interest and comment of 

 investigators , but not until recently have they been regarded as hav- 

 ing segmental value. As early as 1828 von Baer observed them in 

 the medulla, and since then they have been noted and commented 

 upon, more or less at length by Remak, Dursy, Dohrn, Foster 

 and Balfour, Beranek, Kupffer, Or r , McClure and others l . 



1 Vide bibliography in »The Primitive Segmentation of the Vertebrate Brain«, 

 by Charles F. W. McClure. Zoologischer Anzeiger No. 314, 1889 and Journal of 

 Morphology, Vol. IV, No. I. 



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