362 Dr. II. E. Zieyler on Amitotic Nuchur Dicision 



ostrum, with antenrial spines and with an arched median, 

 dorsal, spinj crest on the gastric region. There is no trace 

 eitlier of eyes or even of eye-peduncles. First and third 

 pairs of legs of the usual Crangonine form ; second pair non- 

 chelate, rather robust, with fringes of long plumose setae, 

 their dactylopodites minute, setulose ; third and fourth pairs 

 rather more robust than, but similar to, the second, with 

 successively move minute and less gressorial dactylojiodites, 

 also furnished with long fringes of plumose setae. Abdomen 

 compressed, smooth, transversely convex, without spines or 

 carina;. Telson thin and depressed. 



34. Prionocrangon ommaiostereSj sp. n. 



The serrated gastric crest is seven-toothed. 



The animal measures in length, from tip of rostrum to tip 

 of telson, alx)nt .^0 millim., of which the carapace from tip of 

 rostrum to middle of hinder margin is about 10 millim. 



A single somewhat mutilated specimen from Station 110, 

 405 fathoms. 



[To be coutiuiud.] 



XLVIII. — The Biological Import of Amitotic (Direct) Xuclear 

 Division in the Animal Kin(/dom. By H. E. ZiEr.LKR, 

 Ph.D., Extra-ordinarv Professor of Zoology, Freiburg 

 i. B. ^ 



In W. Flemming's most recent paper t we find the following 

 passage : — " As regards the fragmentation of the nuclei of 

 leucocytes — and amitotic nuclear division in general — it 

 appears to me not impossible that the following view could 

 also be held. The leucocytes, like the cells of other tissues, 

 perform their normal physiological reproduction b}' means of 

 mitosis ; those cells only which have come into existence by 

 this process preserve tlie faculty of continuing to live and of 

 producing similar cells in the same manner. Fragmentation 

 oj the vucleus, tvith and icithout subsequent division of the cell, 

 is universally a process in the tissues of Vertebrates^ ichich 



* Translated from tlie ' I^iolopisclies Centralblutt," Bd. xi. nos. ]'2 and 

 13, pp. 072 .".80, .July 1.'). IsiH. 



t >V. Flemining', " Leber Teilung mid Kernfonnen bei lienkocvten mid 

 iiber doren Atlraktionssphiiren," Arelii% 1". iiiikr. Aiialuiiiif, 37 Bd., 1>01. 



