Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 

 Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XXV. Band. 



21. Juli 1902. 



No. 677. 



Inh 



I. Wissenschaftl. Mittheilnngeu. 



1. Pratt, The Mesogloeal cells of Alcyonium 

 (preliminary account). (With 4 figs.) p. 545. 



2. Bäcker, Zur Kenntnis der Gastropodenaugen. 

 p. 548. 



3. Grünberg, Ein neaer Anopheles aus West- 

 afrika, Anopheles Ziemanni nov. spec. p. 550. 



4. Dawydoflf, Über die Regeneration der Eichel 

 bei den Enteropneusten. p. 551. 



5. Verhoeff, Über einige paläarktische GeojjM- 

 liden. (Mit 2 Figuren.) p. 557. 



alt: 



6. Clark, Notes on Some North Pacific Holo- 

 thurians. p. 502. 



II. Mittheilnngeu ans Museen, Instituten etc. 



1. Natnrretenskapliga Stndentgällskapet, 

 üpsala. p. 564. 



2. Zoological Society of London, p. 567. 



3. Linnean Society of Neiv Sonth Wales, p. 568. 



lil. Personal-Notizen. (Vacat.) 

 Litteratnr. p. 433—456. 



L Wissenschaftliche Mittheilungen. 



1. The Mesogloeal cells of Alcyonium (preliminary account). 



By Edith M. Pratt, Owens College Manchester. 



(With 4 figs.) 



eingeg. 4. Mai 1902. 



While working at the anatomy of certain species ofAlcyonaria 

 hitherto included in the genus Lobophytum, I observed that the 

 stellate and spindle-shaped cells and fibrils which form the socalled 

 mesogloeal "nerve plexus" are remarkably numerous and of an unusu- 

 ally large size. 



In his account of the anatomy oi Alcyonium (Quart. Journ. Mici. Sc. 

 Vol. 37. pi. IV. p. 371.) Hick s on calls attention to the fact, that while 

 this system of cells and fibrils has not been experimentally shown to be 

 nervous in function, yet it is undoubtedly homologous with the larger 

 called "Nervenschicht" by the H er twig's in the Actiniae. 



In order to determine the function of this system of cells it was 

 necessary that experiments should be made on living material, and as 

 it is impossible to obtain living specimens of any species of Loho- 

 phytu7n in England, my observations have been limited to a study of 

 the British genus Alcyonium. 



At Port Erin, Isle of Man. I was fortunate in obtaining numerous 



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