Boone, Crustacea, Cruise of ''Alva," 1931 203 



The inner lateral margins of the merus and ischium also have heavy, 

 close brushes of short, reddish brown setae. 



The orifice above the base of the chelipeds has a very dense brush 

 of thick long setae on its lower edge and a thinner fringe above on the 

 upper edge. 



The chelipeds of the male are subequal, two and one-third times as 

 long as the carapace, with the three-sided merus projecting more than 

 half of its length beyond the carpus, its anterior lateral margin setose 

 and rough with coarse granules, which also emphasize the hinder lat- 

 eral margin ; both lower surfaces are covered with granules, the upper 

 surface being comparatively smooth ; the carpus is rounded on the 

 upper surface, denticulate with a cluster of larger, spinose granules at 

 the inner angle; the propodus is high and is twice as long as high, 

 thickish, but laterally compressed, the upper margin subcarinate ; the 

 inner lateral surface curved ; the upper outer surface convex, flattish ; 

 the lower distal portion deflected as are also the very curved fingers; 

 the lower propodal margin is carinate, this carina extending to the tip 

 of the finger; the lower surface is very granulose; the fingers are re- 

 markably downbent, with a narrow, buttonhole-like gape ; the tips are 

 subacuminate, meeting. The lower finger has one, large, rounded, sub- 

 basal molar, the upper surface of which is cut into ten or twelve small 

 denticles; the distal portion of the cutting edge is set with ten or 

 twelve small, blunt teeth, semi-concealed beneath the fringe of setae 

 along the outer margin ; the upper finger is decidedly more curved 

 than the lower one and has a small basal molar, beyond which the en- 

 tire cutting edge is set with low, small, blunt teeth, also obscured by 

 the outer fringe of setae. The entire inner lateral surface of both 

 fingers and related distal end of the propodus are covered with densely 

 set short setae and in addition there are at the tips of the fingers 

 longer, reddish setae. In life, when the chelipeds are pressed against 

 the carapace, these fingers are in position above the maxillipeds and 

 the heavy setae may possibly serve as extra sieves for the muddy 

 water. 



The female chelipeds are equal to each other, but much weaker than 

 those of a male of the same size, being only about as long as the cara- 

 pace and quite fragile ; the fingers lack the large molars and the inner 

 setose patches of the male are only represented by a fringe of long 

 reddish setae. 



The ambulatories are quite slender, longish, increasing slightly in 

 length in the order 1, 2, 3, the fourth pair being decidedly shorter and 

 smaller than the first pair. 



