Boone, Criistacea, Cruise of "Alva," 1931 121 



merus, fingers about two-fifths as long as the palm and bent dis- 

 tally, very curved; cutting edges meeting, tips slightly overlap- 

 ping. The great cheliped is larger than the smaller one in the ratio 

 shown in Plate 31 ; the most conspicuous difference being in its 

 more dilated aspect. The merus is as long on its upper margin 

 as is the carapace, exclusive of rostrum ; the upper meral surface is 

 linear, slightly rounded distally because of the curvature with the 

 inner lateral surface; the outer lateral surface is approximately 

 a wide flatfish oval, its greatest width being about one-half of 

 the meral length ; the upper lateral margin is moderately convex 

 in profile ; the lower lateral outer margin is more convex distally 

 than proximally and much more so than the upper margin ; the 

 ventral -m.eral surface is excavate for the reception of the reflexed 

 carpus and propodus; the carpus is short, little more than half 

 as long as the finger, dorsally very convex; the propodus is 3 

 millimeters long, or as long as the carapace, including the rostrum, 

 and is moderately dilated, its greatest width or thickness being 

 near the proximal end and being about equal to one-third of the 

 total length of the propodus and finger ; the upper, or outer surface 

 of the palm is quite convex, and distinctively, irregularly tapered ; 

 the propodal finger is short, not quite one-third of the total length 

 of the palm, and distinctively down-curved in its entire length 

 and also with the tip portion curved inward, the tip acuminate, 

 jutting beyond that of the upper finger; the upper finger appears 

 more curved than the lower one, fitting closely upon the opposed 

 cutting edge and is a little slenderer with the acuminate tip a trifle 

 shorter than that of the related lower finger. The female specimen 

 lacks both first chelipeds. An excellent description, with figure 

 of these, is given by M. Coutiere. 



The second pair of legs are subequal to each other. The left 

 leg is very slender and measures : ischium, 0.9 mm. long ; merus, 

 1.1 mm.; carpus: first article, 0.7 mm.; second article, 0.2 mm.; 

 third article, 0.2 mm. ; fourth article, 0.25 mm. ; fifth article, 0.5 

 mm.; propodus: palm, 0.5 mm.; fingers, 0.45 mm. each, very 

 slender. 



The third pair of legs are quite slender, about one and one- 

 fourth times as long as the carapace ; the ischium is 0.5 mm. long; 

 the merus, 1.1 mm. long; the carpus, 0.45 mm. long, with a small 

 distal dorsal spine ; the propodus is 1.5 mm. long and is 0.4 mm. at 



