THE GRAPSOID CRABS OF AMERICA. 



59 



slightly deflexed, not gaping, prehensile 

 edges finely denticulate; dactylus of right 

 chela with a strong basal tooth. 



Legs slenderer, more cylindrical than in 

 C. typicus; last two joints fringed with 

 long hair. 



Sternum and abdomen smooth; an over- 

 lying plate along posterior margin of fourth 

 sternal segment. 



Measurements. Male holotype, length of 

 carapace 5.3, width of same 5.9 mm. 



Material examined. Known only from 

 the type-specimen from southeast of Andros 

 Island, Bahamas, in Tongue of Ocean; lat. 

 24 02 r 00" N.; long. 77 12' 45" W.; 97 

 fathoms; wh. Oz.; temp. 73.4 F.; Apr. 13, 

 1886; station 2G51, Str. Albatross; 1 male 

 (20509). 



CHASMOCARCINUS CYLINDRICUS Rathbun. 



Chasm ocnrcinus ci/Hndricns RATHRUN, Bull. 

 U. S. Fish Conun., vol. 20, for 1900, pt. 2, 

 1901, p. 10, text-fig. 1 (type-locality, 

 Mayaguez Harbor, Porto Rico, 12 to IS 

 fathoms, station GOG1, Fish Ha it:k ; holo- 

 type male, Cat. No. 237G5, U.S.N.M.). 



Diagnosis. Orbits directed obliquely for- 

 ward and outward. Carapace broad, little 

 narrowed in front; an antero-lateral margi- 

 nal line. Sternum and abdomen granulate. 



Description. Carapace about two-thirds 

 as long as broad, but wider anteriorly than 

 in C. latipes. Fronto-orbital width about 

 half width of carapace. Body subcylin- 

 drical, almost level from side to side, the 

 frontal portion more strongly deflexed than 

 in the other species. Anterior half of lat- 

 eral margin marked by a sharp granulated 

 line. Sutures visible about cardiac region. 

 Surface pubescent and granulate. Front a 

 little wider than the orbit; margin sub- 

 truncate, upper surface with a median de- 

 pression, which in a dorsal view makes the 

 margin appear bifid. Upper margin of 

 orbit concave, directed obliquely outward 

 and a little forward. 



