ISOPODA. 131 



feet long, but wanting on the second and third 

 segments of the thorax. 



J iD' 



C. linearis. Fig. 223 ; J. C. tuberculata. 

 laevis. lobata. 



acuminifera. acanthifera. 



acutifrons. longispina. 



phasma. 



Leptomera (Guerin). As Capretta, but all the 

 segments of the thorax furnished with feet. 



L. pedata. Fig. 224; j- . 



Cyamus (Lamk.). Body ovate, flattened; infe- 

 rior antennas minute ; feet stout, hooked. (Parasitic 

 on Whales.) 



C. erraticus. C. gracilis. 



ovalis. Thornpsoni. Fig. 225 ; j-. 



Sub- Order II. ISOPODA. 



Mouth formed for suction, without 

 maxillae ; no appendages, or only two 

 unjointed filaments behind the fifth 

 pair of false feet Sedentaria. 



Mouth furnished with two pairs of 

 maxillae, as well as mandibles and 

 foot-jaws ; a pair of opercular appen- 

 dages, natatory or style-like, but 

 always jointed behind the fifth false 

 feet : 



Last false feet terminated by hori- 

 zontal swimming-plates Natatoria. 



Last false feet style-like or opercular, 

 not formed for swimming Reptatoria. 



k2 



