50 Notes on NortJi American Crustacea. 



breadth ; tlie proportipn of the breadth to the length in the 

 carapax being 1 : 1-24. It approaches more closely to E. hrasi- 

 liensis, Dana ; but differs in its longer rostrum, and in having 

 two small teeth on the lower edge of the penult joint in the fifth 

 pair of feet. The length of the carapax in our specimen is 0'52 ; 

 breadth, 042 in. 



Found at Indian Eiver, Florida, by G. "Wurdemann, Esq. 



CANCKOIDEA. 

 Cancer boreaIi§. 



Cancer irroratus, Gould ; Inv. Mass, p. 322. 



Stimpson ; Mar. Inv. Gr. Manan, p. 59. 

 Platycarchms irroratus, Gibbes ; loc. cit. 176. 



This species is regarded by Say as the female of his C. ir7V- 

 ratus J and subsequent carcinological authors have thought 

 proper to retain his name for this rather than for the more 

 common species, C. sayi of Gould, which Say regarded as the 

 male. But the rules of nomenclature seem to require that the 

 species to which his figure, and mainly his description corres- 

 pond, should receive the name which he applied by mistake to 

 both. The reason given by Dr. Gould for following the oppo- 

 site course, viz. that Bell has figured this species as C. irro- 

 ratus, will not hold good, since Bell's figure represents a Chilian 

 species, 0. j>lebeius of Poeppig. 



C. horealis inhabits the rocks near low water mark, in the 

 clear waters of ocean shores. It never occurs in muddy or 

 sandy bays and harbors where C. irroratus abounds. It is a 

 northern species, not found south of Cape Cod, although extend- 

 ing to the northward at least as far as Nova Scotia. 



