24 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Ambulatory legs slender; superior margin of meral, carpal, and 

 propodal joints minutely spinulous. 



Second segment of abdomen much narrower than the first and 

 third, exposing the sternum; third segment with angular margins; 

 third, fourth, and fifth segments coalesced; terminal segment with 

 extremity rounded; proximal margin concave. Surface of abdo- 

 men smooth, of sternum granulate. 



Description of female. — The postero-lateral margins are less con- 

 vergent and the lateral teeth are three in number besides the post- 

 orbital tooth. The tooth corresponding to the first one in the 

 male is obsolete; the next two are large and less outstanding than 

 in the male ; last tooth larger in female than in male. Chelipeds less 

 unequal in female than in male. 



Growth variation. — In the young, the first and last of the four 

 lateral teeth of the carapace are obsolete. The merus of the cheliped 

 bears a denticulated elevation instead of a spine, as in the adult. 



Measurements. — Male (11407), length of carapace 7.G, width of 

 same 10.5, width of front 4.1 mm. Female (19880), length of cara- 

 pace 8.1, width of same 10.2, width of front 3.7 mm. 



Range. — East and west Florida ; 13 to 193 fathoms. 



Material examined. — 



Southwest of Cape San Bias, Florida ;^Z&a^ross; Lat. 28° 41' 00'' 

 N.; long. 86° 07' 00" W.; 169 fathoms; gy. M.; Mar. 14, 1885; station 

 2400, 1 female (10879). Lat. 28° 38' 30" N.; long. 85° 52' 30" W.; 

 142 fathoms; gn. M. brk. Sh.; Mar. 14, 1885; station 2401; 1 female 

 (19880). Lat. 28° 36' 00" N.; long. 85° 33' 30" W.; Ill fathoms; 

 gy. M.; Mar. 14, 1885; station 2402; 1 y. (19881). 



Off Sand Key, Florida; Sand Key Light bearing NW. by N., Key 

 West Light N. ^ E. ; 50-60 fathoms ; June 19, 1893 ; statioii 27, State 

 Univ. Iowa Exped. ; 1 male y. (Mus. S. U. L). 



Off Cape Florida; lat. 25° 40' 00" N.; long. 80° 00' 00" W.; 193 

 fathoms; gy. S.; temp. 43.4° F.; Apr. 9, 1886; station 2644, Alha- 

 trass; 1 male (11407). 



Subfamily Goneplacinae Miers. 



Gonoplacinac Miees, Challenger Rept., Zool., vol. 17, 18S6, p. 237. — Alcock, 

 Journ. Asiat. Soc. Bengal, vol. G9, 1900, pp. 286, 293, and 316. 



The anterior border of the subquadrate carapace is entirely occu- 

 pied by the square-cut front and orbits, the front being either narrow 

 or of fair breadth, and the orbits being long, narrow trenches for 

 the elongate eyestalks. In other respects similar to the Carcino- 

 placinae. 



Represented in America by the genus Goneplax. 



