250 CRUSTACEA OF THE UNITED STATES. [May. 



Length one inch and one fifth. 



Considerably resembles the preceding, but differs 

 from it in the number of teeth in the rostrum, in the more 

 attenuated antennae, and greater length of the inner ones; 

 the wrists, hands and fingers also are proportionally dif- 

 ferent, the fingers are a little curved upwards, but in the 

 preceding they are in a right line with the hand. Descri- 

 bed from a specimen in my cabinet; and another in the 

 collection of the Academy, presented by captain Hamil- 

 ton. 



Order STOMAPODA. Latr. 



Head distinct from the thorax, and divided into two 

 parts, of which the anterior one supports the antennae and 

 the eyes; eyes pedunculated; branchia abdominal, placed 

 behind each pair of natatory feet. 



Genus SQUILLA. 



Thorax exhibiting several joints; interior antenna 

 with three, articulated setas; exterior antennae simple, 

 furnished with a scale; abdomen six -jointed; tail flabelli- 

 form. 



8PBC1ES. 



S. * Empusa, Abdomen with eight, four last joints 

 of the thorax with four, raised longitudinal lines; four 

 last joints of the thorax not bifid over the coxae ot the 

 feet; large plate of the thorax angulated over the coxae 

 of the arms. 



Inhabits the coast of Rhodeisland. 



Cabinet of the Academy. 



1 hoi acic plate with an obvious lateral angle before 

 the rounded terminaiion; second segment shortest, two- 



