84 STALK-EYED CRUSTACEA 



very broadly rounded at the branchial regions, where it is 

 armed with teeth or spines ; the dorsal surface is uneven, 

 tuberculated, or spinous. The rostrum is bifid, in general 

 very short, and separated from the inner canthus of the 

 eye by a very considerable space. The eyes are small. 

 The orbits are almost always armed with two or three 

 spines on their superior border, with one on their external 

 angle, and with one or two on the;r inferior border. The 

 internal antennae are bent a little outside, and the frontal 

 portion of the partition which separates them is armed 

 with a spine recurved in front. The basal joint of external 

 antennse is almost always armed in front with two strong 

 spines. The second joint is inserted on the side of the 

 rostrum, nearer to the antennulary fossa than to the orbit ; 

 the third joint is almost as large and as long as the 

 second ; the last joint is generally short. The epistome 

 is transverse. The first pair of legs, in the male, is in 

 general much larger and longer than the second pair ; 

 sometimes twice the length of the postfrontal portion of 

 the carapace ; the hand is dilated and compressed ; the 

 fingers, when closed, have a wide intermarginal space, 

 rarely slender, and the fingers almost in contact when 

 closed. The second pair is about once and a quarter the 

 length of the postfrontal portion of the carapace, and the 

 succeeding pairs become progressively shorter. The last 

 joint is hooked, short, and often armed with a few points 

 on the inferior face. 



The abdomen is seven-jointed in both sexes. Females, 

 when young, may have the second to fifth segment 

 inclusive soldered together. The sternal plastron is 

 almost circular. 



Range. — Warm seas on both coasts of America ; at 

 moderate depths. 



