42 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Description: Surface pubescent. Carapace rough with tubercles and 

 short spines; five median spines: two gastric, one genital, one cardiac, 

 and one above the posterior margin. Branchial region surmounted by a 

 spine, with a row of smaller spines extending obliquely from it to the 

 inner angle; margin anteriorly spinous; a spine near the anteroexternal 

 angle, with an irregular row extending backward above the margin. 

 Hepatic region with a spine near the inner angle and one or two on the 

 margin. Gastric region with a stout marginal spine behind the post- 

 orbital spine, and a dorsal row of spinules extending forward to each 

 rostral horn. Many spines sometimes replaced by tubercles ; two tubercles 

 side by side on the genital and the intestinal regions. 



Rostral horns stout, tapering distally, contiguous, usually less than 

 one-third the length of postrostral portion of carapace, curving down- 

 ward toward the tips. Horns with either a buttonhole interspace or 

 slightly divergent in the terminal portion. A strong, spine-pointed, in- 

 terantennular tooth. Orbital arch unarmed. A conical spine or tubercle 

 on first segment of abdomen. 



Merus and carpus of chelipeds tuberculate and spinous; merus tri- 

 angulate, more or less swollen, upper margin spinous, the row of spines 

 continued on the carpus. Manus roughly granulate, either wide and 

 swollen or narrow and compressed (a less developed form) ; fingers 

 gaping for more than half their length, dactylus with a large tooth mid- 

 way of its length ; immovable finger with a smaller basal tooth ; these 

 teeth much reduced in the narrow form of manus. The two forms of 

 cheliped found in individuals of the same size and from the same 

 locality. 



Propodus of ambulatory legs usually greatly exceeding carpus in 

 length, but occasionally carpus nearly equalling or even exceeding pro- 

 podus. The latter dilated below and the distal half of this expansion, 

 where the dactylus closes, margined with a thick fringe of hair. Dacty- 

 lus, as a rule, more than half the length of the propodus. (Rathbun, 1925, 

 modified) 



Description of the male pleopods: Two pairs of male appendages, 

 the first pair formed of a piece quite strongly curved on the outside, 

 presenting at its extremity a small prolongation forming nearly a right 

 angle with the general direction of the appendage (fig. 177 of the origi- 

 nal). The second pair of appendages small, formed of two pieces, the 

 second curving on the outside in a very open hook (fig. 178 of the 

 original). (Brocchi, 1875, p. 90) 



In the first variety (var. a), which is to be regarded as the typical 

 form, as shown by Guerin-Meneville's original figure, the palm is moder- 



