Boone, Crustacea, Cruises of "Ara" and "Alva" 271 



the uropoda, the entire surface being elegantly sculptured by- 

 flat, transverse, posteriorly ciliated carinae, which are inter- 

 rupted and curved, following the contour of the somite. This pat- 

 tern is continued on the uropod peduncle and proximal portion 

 of the telson, their distal portions being paved with smaller, 

 curved, posteriorly convex and ciliated squamae. The telson is 

 one and a third times as long as the pretelsonic somite, with the 

 distal margin widely rounded, fringed with long, silky setae. The 

 two lateral lines that cut the telson are oblique. The uropod 

 peduncle has a small spine at the inner distal angle; the blades 

 are truncate distally, with the inner distal angle widely rounded, 

 the usually exposed outer dorsad portions of each blade paved 

 with squamae as on the telson. 



The chelipeds are equal, 130 millimeters long on specimens 

 having the carapace plus the rostrum 55 millimeters long. These 

 chelipeds have the merus 50 millimeters long on the outer margin, 

 triquetral, with the upper-inner margin serrate with coarse spines, 

 a second submedian series of smaller spines on the upper surface, 

 the three upper distal angles spinose; the carpus is 16 milli- 

 meters long, similarly triquetral and spinose on the inner-upper 

 marginal and distal angle ; the propodus and dactyl are 62 milli- 

 meters long, the palm being 34 millimeters long and 12 milli- 

 meters wide, distally, and the fingers 28 millimeters long. The 

 palm is moderately dilated distally and bears a submedian longi- 

 tudinal carina composed of erect, spinose squamae; both lateral 

 margins of the palm and dactyli are similarly margined. The upper 

 and outer surfaces of the merus, carpus, propodus and dactyli 

 are almost continuously paved with these distally acute or spinose 

 squamae, semiconcealed beneath a dense pilosity on the merus, 

 carpus and propodus which is nearly absent on the dactyli, except 

 along the bases of the cutting edges, the dactylar surfaces being 

 continuously paved with these asperities which are subequal in 

 size or a little larger than the teeth along the cutting edge. The 

 apices of the dactyli are each incurved acuminate teeth. 



The first, second and third pairs of ambulatories are similar 

 and decrease in length in the order named, the first pair having 

 the dactyli reaching to the base of the propodi of the chelipeds 

 and the second and third pairs each decreasing in length by about 

 the length of their respective dactyli. Each ambulatory has the 



