56 THE LIFE OF CRUSTACEA 



remain. The animals live in the sea, clambering 

 among sea-weeds or zoophytes in a fashion which 

 recalls the movements of " looper" caterpillars. The 

 Cyamidce, or " Whale-lice " (Fig. 23), are, as the name 

 implies, parasites on the skin of whales, and are 

 closely related to the Caprellidae. They have, how- 

 ever, a broad, flattened body, more like that of an 



FIG. 24 Meganyctiphanes norvegica > ONE OF THE EUPHAUSIACEA. 

 TWICE NATURAL SIZE. (From Lankester's "Treatise on 

 Zoology.") 



Isopod than an ordinary Amphipod, and their legs 

 have strong curved claws with which they cling to 

 the skin of their host. 



The third division of the Malacostraca, the 

 EUCARIDA, consists of two orders of very unequal 

 interest and importance. The first of these, the 

 order EUPHAUSIACEA (Fig. 24), comprises only a 

 single family of small, shrimp-like Crustacea found 

 swimming freely at the surface or in the depths of 



