CUMACEA. 



473 



into regions which correspond approximately with those found 

 in the Stomatopods. 



The oval cephalothorax includes the three anterior thoracic 

 segments. It is produced laterally into folds fitting closely at. 

 the margins, including a respiratory chamber on either side. 



FIG. 2&2.Diastylis sculpta. a male, and b female (from Claus). 



Anteriorly the sides of the cephalothorax extend forwards and 

 (except in Stephanomma) meet one another, forming a bi-partite 

 pseudo-rostrum in front of the rostrum proper. The eyes, when 

 present, are situated on the latter. The surface is smooth 

 in the males but frequently spiny in the females and produced 

 into ridges. 



The long abdomen is capable of being bent forwards, either 

 ventrally or dorsally, the latter movement having suggested the 

 name Oniscus scorpioides, under which Lepechin gave the first 



