Zoologisoher Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XIX. Band. i. Juni 1896. No. 504. 



Inhalt: I. Wissenschaftliche Uittheilnngen. 1. Montgomery, Preliminary Note on the Histo- 

 logy of CerebratuUis lacteiis, Verrill. 2. Haller, Bemerkungen zu Professor van Gehuchten's Kritik 

 ûher meine Arbeit: »Untersuchungen über das Rückenmark der Teleosteer«. 3. Ijinia , Notice of 

 New Hexactinellida from Sagami Bay. II. Mittheil, ans Mnseen, Instituten etc. 1. Zoologica 

 Society of London. 2. Liuuean Society of New Sonth Wales. III. Personal>Notizen. Vacat 

 Bibliographia. p. 269— 284. 



I. Wissenschaftliche Mittheilungen. 



1. Preliminary Note on the Histology of Cerebratulus laoteus, Verrill. 



Von Thos. H. Montgomery jun., Ph. D. 



eingeg. 9. März 1896. 



A recent paper has appeared upon the anatomy and histology of 

 this species, by W. R. Coe (1895); the present note is intended to 

 give certain results of my own histological investigations upon this 

 Nemertean, and will be followed by a more elaborate paper on the 

 subject. 



One pair of neurochord cells are present in the ventral lobes of 

 the brain and a considerable number are placed at irregular intervals 

 along the lateral nerve chords; these cells have escaped the obser- 

 vation of Coe (1. ci. By making series of thin transverse sections of 

 an immature individual (about 6 inches long), out of different regions 

 of the body, so that, in all, about four-fifths of the specimen was 

 sectioned, I was able to study the distribution of these cells. The 

 number of the neurochord cells dorsally and ventrally, in each lateral 

 nerve chord, is as follows: 



Right Chord Left Chord 



Dorsal Ventral Dorsal Ventral 



68 16 55 20 



Thus in the four-fifths of the individual sectioned, 159 neurochord 

 cells were found; of these, 84 were in the right chord, and 75 in the 

 left. Further, in each chord a larger number is situated dorsally, than 



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