162 CRUSTACEA. 



Pilumnus (Leach). Carapace much broader 

 than long, four-sided, front margin arched, and 

 bent downwards, surface even. 



P. hirfcellus. Fig. 310 ; n. s. 



Xantho (Leach). Carapace broad, slightly con- 

 vex longitudinally ; front margin semi-oval, notched 

 with few blunt teeth : first feet very stout, all the 

 rest small and short. 



X. florida. Fig. 311 ; f n. s. 

 rivulosa. 

 tuberculata. 



Cancer (Linn.). Carapace very broad, nearly 

 oval, elevated in the middle ; edge on each side 

 notched with ten square, close-set teeth ; first feet 

 stout, the rest moderate. 



C. pagurus. Fig. 312 ; -jL n . s. 



FAMILY VIII. PARTHENOPIDJE. 



Eurynome (Leach). Carapace lozenge-form, 

 with a prominent cleft beak ; eyes retractile ; whole 

 body and limbs covered with spines and knobs. 



E. aspera. Fig. 313 ; n. s. 



