146 



CRUSTACEA. 



Thysanopoda (M.-Edw.). Gills in the form of 

 plumes at the base of the true feet ; last pair of 

 feet unbranched. 



T. Couchii. Fig. 274 ; mag. f . 



Family III. Pjhyllosomad^e. 



Pliyllosoma (Leach). Carapace broad, oval, leaf- 

 like ; thorax similar ; eyes on long stalks. 



P. commune. Fig. 275 ; n. s. 



275 



Sub- Order II. DEC APOD A. 



Feet almost always five pairs. Gills composed 

 of numerous parallel plates enclosed in a cavity 

 on each side of the body. Head soldered to the 

 thorax, and covered with a carapace, which reaches 

 to the abdomen. 



Abdomen well developed, carrying 

 swimming organs Macrura. 



