72 CAPRELLID^. 



The body of this animal is smooth. The head is 

 round and unarmed. The first segment of the body 

 is very long, cylindrical, and slender. The second seg- 

 ment is as long as the first, and resembles it, except 

 that as the first gradually lessens in diameter pos- 

 teriorly, the second as gradually increases posteriorly, 

 and is armed inferiorly, in the ventral median line, with 

 a long straight tooth, between the articulations of the 

 second pair of arms. These two segments, with the 

 head, occupy half the length of the animal. The 

 remaining five segments of the body are, therefore, 

 shorter than in the majority of the species of this genus. 

 The superior antennae are not half the length of the 

 animal; the first joint of the peduncle is longer than 

 the head ; the second more than twice the length of the 

 first ; the third about half the length of the second, and 

 does not taper at the extremity : the flagellum is about 

 half the length of the third joint of the peduncle, and 

 half the diameter at the base. The inferior antennse are 

 not half the length of the superior. The first pair of 

 legs are very small, and situated at the extreme anterior 

 limit of the first segment of the body, therefore close to 

 the head. The second pair of legs articulate with the 

 second segment near the posterior extremity, conse- 

 quently are situated about the centre of the animal, a 

 circumstance from which we presume that Say gave the 

 animal its specific name; the hand is long, and some- 

 what oval in its general form, but the palm, which is 

 defined by a small tooth, is straight, running nearly 

 parallel with the upper margin, and occupying about 

 two-thirds the entire length of the hand, which is more 

 than half the length of the second segment of the body ; 

 the palm is armed at the anterior extremity with an 

 acute tubercle or short tooth and a small denticle (which, 



