438 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



Penultimate segment short, less than j^ length of distal segment, 

 which has rows of stout bristles medially. 



First leg large, usually nearly twice length of carapace, with chela 

 as long as, or longer than, carapace. Ischium short. Merus shorter 

 than chela, somewhat triangular in cross section, distal margin 

 rounded; ventral with two tuberculate ridges separated by shallow 

 sinus. Outer ridge protruding distally to form broad flat process. 

 Outer surface of merus with broad, oblique sinus, devoid of tubercles, 

 into which second leg may fit. On inner surface a longitudinal sinus 

 and distally a deep transverse groove. Large membranous area 

 ventrally into which flat, platelike toothed process of carpus fits. 

 Scattered tubercles over most of surface. Carpus short, rounded 

 dorsally, with transverse and longitudinal sinuses. Chelae (figs. 

 11, 13, 14, 30, 31) finely tuberculate, spinulate, with fine pubescence, 

 especially dorsally. Not compressed but somewhat flattened on inner 

 side of pahn. Great variation in proportion, length, width, dentition 

 of palm and fingers. Fingers occasionally subequal to palm but usually 

 about Yz as long. Gaping, large-toothed type much more common 

 than nongaping, finely denticulated form described by Rathbun 

 (1904). (There can be no doubt that both types are found in B. 

 harrimani, as a number of specimens have one chela of each type. 

 One such, kept in the laboratory, had the chehpeds injured and the 

 regenerated chelae both had nongaping fingers). Tips of fingers 

 curved, with chitinous parts interlocking. 



Second leg (fig. 37) very slender, with elongated ischium, nearly 

 as long as 5-jointed carpus, longer than merus. First joint of carpus 

 equal in length to next three together, or to chela; second shghtly 

 longer than subequal third and fourth; fifth, twice fourth. Chelate, 

 with palm longer than fingers, tips setose. 



Third and fourth legs (figs. 9, 38) slender, somewhat flattened. 

 Ischium subequal to carpus, about ^ length of merus. Merus 

 slightly inflated, with movable spine. Carpus with two ventral 

 terminal spines. Propodus with ventral marginal spines and setae: 

 terminal pair stout, and group of bristles dorsally. Dactylus (fig. 

 39) curved, thin, sharp-pointed, with curved setae dorsally; more 

 than K length of propodus, which is nearly as long as merus. 



Fifth leg (fig. 10) similar in size and spinulation to third and fourth, 

 but with transverse bands of setae forming brush on distal half of 

 propodus. 



First pleopod with smaU, sparsely setose endopodite. Second 

 to fifth with endopodite and exopodite subequal. Appendix interna 

 straplike. 



Uropod (fig. 26) with distal margin of peduncle scalelike, produced 

 into two subequal teeth, curved margin between armed with long 



