Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 11 



Technical description : Carapace pyrifirm, 9.25 mm. long, 6.5 mm. 

 wide, surface nearly devoid of cilia, but covered with large, pearly 

 granules which are much less abundant in the sulci that sharply de- 

 limit the regions. Kostrum small, subtriangulate, apex bifid. The 

 superior margin of the eye is delimited, margined with granules, one 

 of which, the median, forms a tubercle. There is also a median tubercle 

 on the gastric, one on the cardiac and a pair, side by side, submedian, 

 on the apex of the intestinal region. The apex of the branchial region 

 also bears a prominent tubercle, and there are two, sometimes three, 

 tubercles on the lateral branchial margin, and two more on the lateral 

 hepatic margin. These lateral tubercles are much enlarged on the 

 male, but on the female they do not appear as tubercles, only as nor- 

 mal granules. The large tubercle present on the apex of the dorsal 

 branchial surface in the male is obsolete in the female, and the paired 

 submedian tubercles of the intestinal region of the male are usually 

 represented by one tubercle on the female, according to Stimpson and 

 Rathbun. However, one of the females taken by the " Ara" shows two 

 rudimentary tubercles on the intestinal region. 



The male chelipeds are much longer than those of the female and, 

 while slender, have the palm much more swollen; the meral, carpal, 

 and propodal joints are ornamented with longitudinal rows of gran- 

 ules ; there is a strong tubercle on the upper distal angle of the ischial 

 joint and the inner and outer upper distal angles of the merus are 

 each tuberculate. The fingers are long, slender, with an elliptical 

 gape ; their edges are set with sharp little teeth. The female chelipeds 

 are weak, the palms not swollen, and the long, slender fingers not 

 curved and less gaping. In the male the first pair of ambulatories are 

 exceedingly long, extending beyond the length of the cheliped by the 

 entire length of the long dactyl. The second pair of ambulatories 

 reach only to the base of the propodus of the first pair of ambula- 

 tories; the third pair of legs reach only to the base of the propodal 

 joint of the second pair, and the fourth pair of legs are correspond- 

 ingly shorter than the third pair. In the female the ambulatories 

 similarly decrease in length posteriorly, but the first pair are not so 

 conspicuously elongated as in the male. The male abdominal belt is 

 small, triangulate ; both it and the adjacent sternal plate are covered 

 with granules. The female belt is large, subcircular, and covered with 

 large granules. Each of the females captured is carrying from 50 to 

 60 eggs. 



