STALK-EYED CRUSTACEA 67 



deep and abrupt at their margins. All the projections 

 are marked with deep and irregular depressions ; the 

 spaces between them are finely granular. The gastric 

 region is formed of three lobes : two protogastric, rounded 

 and lateral ; the other, mesogastric, is prolonged into a 

 point between them. The anterior cardiac lobe is wide, 

 notched behind, and separated from the posterior cardiac 

 lobe by a broad space ; this lobe is continued into a 

 ridge which follows the posterior border of the cara- 

 pace. The hepatic region is small and almost fused with 

 the branchial regions, which are much dilated on the 

 outside. 



The rostrum is longer than the postorbital portion 

 of the carapace ; it is formed of two horns soldered 

 together at their base, free, but placed side by side to 

 their extremities, and almost smooth. The suborbital 

 border is thick and corroded. The legs are cylindrical 

 and unarmed. The sternal plastron has ridges and 

 depressions, which gives it a corroded appearance. 



Range. — Barbados ; in deep water. 



c. Basal joint of external antenncB often very much 

 enlarged, zvith one or more spines at its distal extremity. 



e'^. Spine at antero-external angle of ant ennal joint very 

 short, and not visible from above : — 



5. Pericera. 



Pericera . Latreille, A. Milne Edwards, Miers. 

 Cancer . . Herbst. 

 Maia Pisa. Latreille. 



The carapace is subpyriform, rather convex, with the 

 dorsal surface uneven, tuberculated, or spinous, lateral 

 margins armed with a series of long spines ; the 



