AMl'HIPODA OF SOUTHERN NEW ENGLAND. 



503 



the male; palm oblique, but not nearly so much so as in the male, and devoid of median concavity, 

 being gently and evenly convex. In the second gnathopods the carpus is both longerand broaderthan 

 the hand, which is much like that of the male in shape, but is mure nearly rectangular, with palm 

 almost transverse and gently and evenly convex; postero-lateral angles of the second and third 

 abdominal segments not produced nor sharp-pointed; three fascicles of spines on each of the three 

 posterior abdominal segments, the spines on each segment being arranged in two rows which converge 

 anteriorly; terminal uropods with miter ramus large, both margins armed with three t<> live fascicles 

 of stout spines; inner ramus small, often less than one-third the length of outer; telson with three 

 -piles at the tip of each half and one on a pair <>f spines close to outer margin near base. 



Length, 15 mm. 



This species is found under stones at low tide. It has been taken at New Haven, various places 

 in Vineyard Sound and Buzzards Hay, Newport, and Woods Hole. 



A comparison of specimens from New England with specimens of Oammarus marinus Leach, from 

 North Devon, England, shews a similarity in all essential respects between forms from these two 



remote localities. In specimens from our coast the se nd gnathopod is a little smaller relatively to 



the first than in the specimens examined from England. 



Carinogammarus mucronatus (Say I. 



Gammarw mucronatus say. Jour. Acad. Nat. Sci. Pnila., Vol. I, 1818, p. 376. 



lives reniform; first antenna? a little longer than second; first joint of peduncle longer than second; 

 third joint about three-fifths the length of preceding one; flagellum about twice the length of peduncle; 



Carinogammarus mucronatus. Great Egg Harbor, N. J. 



secondary flagellum not half the length of peduncle and composed of three or lour joints; second 

 antenme with flagellum about equal to peduncle and composed of about ten oblong joints; first four 

 coxal plates deep; the first one oblong, of similar shape to the second and third; fourth deeper than 



