^ 246 CRUSTACEA OF THE UNITED STATES. [May. 



Length, male four fifths of an inch, female one inch. 



It is very possible that this may be the young of the 

 preceding, notwithstanding its diverse characters, but wc 

 are at present disposed to consider it as distinct. The 

 above description is drawn from seven specimens of dif- 

 ferent ages, all agreeing perfectly in these traits. They 

 occurred in recent Spongia, &c. cast ashore by the 

 waves. 



Genus CRANGON. 



interior feet largest, monodactyle, and furnished 

 with a spurious finger; second and third pairs very slen- 

 der, simple; fourth and fifth more robust; antenna in- 

 serted in nearly the same horizontal line, exterior ones 

 with a large scale at base, interior ones of two setas; ex- 

 terior caudal lamella simple. 



SPECIES. 



C. * septemspinosiis. Rostrum not so long as the 

 eyes, with a spine behind it on the thorax, and another on 

 each side; anterior feet armed with a spine on the third 

 joint beneath. 



Inhabits bay shores and inlets of the sea. Common. 



Thorax seven. spined, one of which is placed on the 

 back before the middle, a lateral one on each side in a 

 - line with the dorsal one, another at the external canthus 

 of the eye, and a more prominent one at the anterior an- 

 gles, situated adjoining a shorter one with which the ba- 

 sal joint of the scale of the exterior antennae is armed; 

 two impressed lines arising, one from an oblique fissure 

 in the superior margin of the orbit of the eye, and the 

 other at a fissure in the external canthus, are confluent 



