British Freshwater Entoviosiraca. 



355 



C. st'losa is cliaiaoterized by the presence of small spines 

 all over the body, these spines spriiij^iiig from every node 

 of the conspicuous reticulations of the shell and head, 

 Lilljeborg states that, in the male, they do not arise from 

 the nodes only, but I have not found any difference between 

 the sexes in this respect. Similar spines are described in 

 C. echinatn, Moniez, and in C. acaatkhia, Ross, but in the 

 foinier the postabilomen is even broader than that of 



I'ig. 1. 



&.*-£(="• 



Ctriodaphnia setosa. 



A. Ei)hippial female. 

 H. Ilend of male. 



C. Fornix and marfjiii of epliippium of female. 



D. Postabdomen of female. 



C. laticauda/a, and in the latter the front of the head is 

 said to bo smooth, while the postabdominal claws arc denti- 

 culate. 



The cphippium is marked off from the valves by a 

 broad, clear space which is free from reticulations, and 

 the cphippium itself is covered with small reticulations, 

 each with a small knob or boss in the centre, but with 



no spines. 



24* 



