1818.] OBSERVATIONS. 443 



terior edge as in pelagicus, and the carpus is destitute of 

 a spine. It is further distinct from the latter, and approx- 

 imated to reticulatus above mentioned, by the granulated 

 cheeks and sides of the body, and the abruptly smaller^ 

 orbicular, terminal joint of the abdomen in the female^ 

 inserted into a profound sinus of the penultimate joint. 

 These and other traits contribute to refer it to my indi- 

 cated genus Sesarma, It is probable, this genus will com- 

 prehend the land species, of the present genus Grapsus. 



Oc Y p D E pugillator. Although this species approach- 

 es nearest to the genus Uca of Dr. Leach, yet it is at 

 the same time widely distinct from it. In a work now 

 publishing, the Nouv, Diet. d^Hist, Nat. Mr. Latreille 

 has revived a genus, which Buffon called Gelasimus, 

 to include this species, and its two kindred ones. 



AsTACus affinis and Bartoni vary somewhat in their 

 armature, but the form of the rostrum in each species 

 continues constant. The latter species has the hands 

 differently proportioned, with respect to the thumb, and 

 more or less muricated. They are extremely common 

 in the pine- barren marshes of the southern states, and 

 particularly in those of Georgia and Florida. 



LuPA hastata. I have often had an opportunity of 

 observing the feet of this species regenerating; one of the 

 joints, I think the third, appeared first, the remainder of 

 the foot was as it were doubled, and was gradually elon- 

 gated until the tip of the foot was disengaged. 



We found the hastata in the river St. John, Florida, 

 as far as Fort Picolata, one hundred miles from the sea, 

 where the water is potable. 



Dr. Leach informs us, that the fishermen of England 

 believe that the Fortumts depurator insinuates its flat- 



