JOURNAL 



OF THE 



Academj of Natural Sciences 



OF 



PHILADELPHIA, 



No. 5. • SEPTEMBER, 1817. Vol. I. 



An Account of the Crustacea of the United States. By 

 Thomas Say. Mead Aug, 5, 1817. 



(Continued.) 



Genus LUPA. Leach. 



Terminal joints of the posterior feet formed for svvin> 

 Hiing. Anterior feet equal, arms spinous before; Pedun- 

 cles of the eyes short, thick; Orbit above with two fis- 

 sures, beneath at the outer angle with one. Fourth seg* 

 ment uf the abdomen of the male elongated, narrower than 

 the preceding. Thorax transverse, nine toothed on each 

 side, the posterior tooth largest. 



SPECIES. 



1. L. hastata. Thorax equal, with distant jrra- 

 nulae; clyp^us three- toothed; arms diree-spiucd; caij.u.g 

 imarmed. 



Inhabits bays, &c.. Very numerous. 

 Vol. 1. jb. 



