JOURNAL 



OF THE 



Academy of Natural Sciences 



or 

 PHILADELPHIA. 



N(». 6. OCTOBER, 1817. Vol, I. 



An Account of t/ie Crustacea of the United States. By 

 Thomas Say, Read October 7, 1817. 



(Continued.) 



Since the preceding part of this paper w^s put to press., 

 Captain James Hamilton presented to the Academy seve- 

 ral crustaceous animals collected by himself in the Gulf 

 Stream; amongst these were some specimens of Lupa 

 pelagica, of which I have inserted a description in order 

 to exhibit the difference between it and the L. hastata 

 which it resembles considerably, 



Lupa pelagica, Clypeus four-toothed; third joint of the 

 anterior feet four-spined; carpus two-spined; hands cilia- 

 ted on the interior upper edge. 



Inhabits the Gulf- Stream. 



Portunus pelagicus. Fabr. and Latr. 



Thorax variegated, with minute granulae; seven of the 

 lateral teeth equal, equidistant, one at the posterior can- 

 thus of the eye larger, posterior tooth much larger, spini- 

 form; clypeus four-toothed, and the anterior canthus of the 

 eye elevated, the two middle teeth rather smaller, third 

 Vol.. I. . Q 



