396 REPORT OF NEW JERSEY STATE MUSEUM. 



ably concave. Terminal abdominal segment rounded. Post- 

 abdomen broader in female, terminal segment rather triangular. 



Antennules robust. Antennae slender, when depressed reach to 

 or a little beyond outer edge of orbit. Latter rather ovoid and 

 moderately large. Eye large, with slightly more robust short 

 peduncle. Outer maxillipeds completely cover buccal cavern, 

 which latter a little broader above. Ischium with width half 

 its length, and merus with length three-fifths its own width. 

 Chelipeds very unequal, pollex with low edge nearly straight and 

 much stronger than dactyl, which latter strongly curved down, 

 and edges with a few more or less irregular obsolete tubercles, 

 edges also not approximated except at tips of fingers. Propodus 

 swollen to greatest and elevated depth at articulation of dactylus, 

 so that depth about three-fifths its length. Hand minutely 

 granulated, slightly rougher above and surfaces otherwise evenly 

 convex. Carpus with short inner tooth on anterior inner superior 

 edge, and upper convex surface of joint granulated. Merus a 

 little longer than carpus. Ambulatory feet similar, all more or 

 less hairy, especially on outer joints, as dactyls, and propodi and 

 meri. Dactyls of last pair of feet shortest. 



Color muddy-brown, more or less uniform above. Examples 

 with the carapace 14 mm. long and 19.5 mm. wide have been 

 recorded. 



Remarks. — Found along the Atlantic Coast from Cape Cod 

 to Florida and the Gulf of Mexico. It is abundant on muddy 

 bottoms, and in general color greatly resembles the same sur- 

 roundings in which it dwells. My specimens from the oyster 

 grounds of Great Bay in Ocean County. It is a slow-moving 

 crab and not very active as seen crawling about among the 

 oysters and clams brought up by the tongs of the oystermen. 

 Females taken July 3d were gravid with ova. These crabs, 

 like others of the family, doubtless form food for numerous 

 fishes and other predatory marine animals. I have also seen this 

 species in abundance on the oyster-grounds off Dias and Green 

 Creeks, in Delaware Bay. Mr. W. T. Davis has secured two ex- 

 amples in Staten Island, N. Y. 



