Boone, Crustacea, Cruise of "Alva," 1931 35 



each bear on the left side a uniramous appendage in the male and 

 in the female, a triramous appendage ; these appendages are well 

 developed on the second, third and fourth segments, but are rudi- 

 mentary on the fifth segment. The telson is calcareous, asymmetri- 

 cal, larger on the left side, as are also the uropoda. 



The eyestalks are thickish, dilated distally, about five-sixths 

 as long as the frontal width of the carapace, exceeding the anten- 

 nular peduncle in length by about one-half the depth of the cornea, 

 the antennular peduncle being subequal to the antennal peduncle. 

 The ophthalmic segment is exposed. The ophthalmic scales are ap- 

 proximated, with their outer distal margins oblique, setose, the 

 apices with two or more spinules each. 



The antennae have the basal article with a sharp spine at both 

 the outer and inner distal angles; the acicule is tapered, acute, 

 the lateral margins spiny and setose, extending to the basal mar- 

 gin of the distal peduncular article ; the flagellum is thickish, as 

 long, or slightly longer than the carapace. 



The male chelipeds are nearly equal in the present specimen, 

 the left being slightly the larger; the merus is trigonal, with the 

 anterior margin serrulate ; the carpus is covered on its outer sur- 

 face with a series of coarse, procurved, conical, thorny, acute 

 spines, each of which has at its base one long and one or two 

 shorter, stiff bristles. The spines are longer and sharper along 

 the upper lateral margin. The propodus and fingers form an 

 elongate oval, the palm being almost as high as long, the fingers 

 are about as long as the palm. Both palm and fingers are covered 

 on the entire outer surface by the same kind of spines and bristles 

 described on the carpus ; these spines are largest along the upper 

 lateral border of the palm. The fingers meet throughout their 

 length and each has a series of triangular teeth ; the tips are 

 corneous, black, rounded and hollowed inwardly and have tufts 

 of bristles inside this concavity. 



The second pair of legs is not so long as the third pair, which 

 exceed in length by about the tip of the dactyl. Each leg has the 

 merus very compressed laterally, the upper and lower lateral mar- 

 gins beset with tufts of setae, as also are those of the carpus ; the 

 upper and outer distal margin of the carpus is also spinose and 

 setose ; the propodus is about one-third shorter than the related 

 dactylus and is armed with a double longitudinal line of spines 

 accompanied by setae; the dactyl is beset with one longitudinal 



