GENUS CANCER. 57 



the food of which they are fond, and which afford them 

 a safe retreat during the periods of incubation and nutri- 

 tion. Our specimen was considered a curiosity at Egg- 

 harbour, and was unknown there even by name. I have 

 often been on the coast of New Jersey, in the spring and 

 autumn, and was equally unacquainted with this bird. 



The sex of this specimen could not be ascertained, 

 as its intestines had been removed before it was forwarded 

 to Philadelphia, and the sexual parts were obliterated. 



jin Account of the Crustacea of the United States. By 

 Thomas Say. Read Aug. 5, lb 17. 



The consequence of the discovery of a new genus in 

 this interesting class of the inhabitants of our cOaSts^ has 

 been the revisal of my manuscript descriptions of the 

 Crustacea, and adetermination to publish them without fur- 

 ther delay, in waiting for more considerable accessions of 

 species. And although the list included in the following 

 paper is not considerable, it may nevertheless form the 

 commencement of a complete account of our crustaceous 

 animals — a very imperfect one it is true, but it may be 

 considered of some importance, in as much as the errors 

 which may be discovered in it, will, by bemg corrected 

 by competent naturalists, iwtroduce us to a more perfect 

 knowledge of these curious depurators of the ocean. 



Order BRACHYURA. 



Genus CANCER. 



Thorax convergent behind. The second joint of the 

 internal peduncle of the external pedipalpi quadrangular^ 



