56 Notes on North American Crustacea. 



hands are longitudinally ridged above, and on the outer surface. 

 The external hiatus of the orbit is very small, but nevertheless 

 distinct. 



This species is remote from Pilumnus in the want of a 

 ridge on the palate, as well as in the presence of the external 

 hiatus of the orbit. Gibbes' description of his P. wurdemanni 

 agrees pretty nearly with it. 



It has as yet been found only in the brackish waters of 

 Charles River, Mass., near its mouth. 



Eiirytiuiu, nov. gen. 



This genus is proposed for the reception of the Panopeus 

 limosus of Say ; which is sufficiently distinct from the typical 

 Panopei in its broad carapax, strong palatal ridge, and in the 

 fiict that the male verges pass* under the margin of the sternum 

 to reach the abdominal appendages, thus showing a relation to 

 the Ocyjpodoidea. 



Eurytiuni lianosum. 



Cancer limosus, Say ; Jour. A. N. S., Philad., i. 446. 

 Panopeus limosus, M.-Edw. ; Hist. Nat. des Crust., i. 404. 



Common on the coast of South Carolina, in mud at low 

 water mark. Specimens brought from Key Biscayne, Fla., by 

 Mr. "Wurdemann are larger, broader, and more highly colored 

 than the Carolinian specimens. 



Driphia squaniata, nov. sp. 



Closely allied to E. gonagra of the Gulf of Mexico, from 

 which it can scarcely be distinguished by any characters de- 



