66 Notes on North American Crustacea. 



Sesarma ang^ustipeis. 



Sesarma angustipes, Dana ; loc. cit. i. 353. pi. xxii. f. 7. 

 " i^icort^?, M.-Edw. ; Mel. Carcin. 149.? 



Carapax more convex and narrower than in S. cinerea, the 

 width (measured between the orbital angles) being less than 

 the length. It is, Iiowever, broader posteriorly. The front 

 is narrower, more projecting, and often sparsely tuberculated ; 

 and the ambulatory feet are longer and narrower than in S. 

 cinerea, to which this species has, in other respects, much 

 resemblance. The dimensions of a male carapax are ; — 

 length, 0-67 : width, anteriorly, 0-65 ; of female, length, 0*75 ; 

 breadth, 0-75 inch. 



I cannot certainly identify this species with S. Hicordi, as 

 the description of Milne-Edwards is very short, and he does 

 not mention the narrowness of the carapax, an important cha- 

 racter. 



In the Smithsonian Museum, there are specimens from Flo- 

 rida, and others collected at Aspinwall by Mr. Kowell. 



8esarma reticulata. 



Sesarma reticulata^ Say; J. A. N. S. Philad. i. 73, pi. iv. f. 5. 

 Gibbes, 1. c. 180. 



This species is so very different from S. cinerea in its thick, 

 swollen, form, and short, thick, acuminated and channelled dac- 

 tyli of the ambulatory feet, that it is surprising how it could 

 have been confounded with it by European authors. In its 

 form, and the prominence of the epistome, it is strikingly like 

 Helice, and it may probably be considered the type of a new 

 genus. 



