Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 181 



margin excavate. The merus is three-fourths as long as the ischium, 

 with the distal margin broadly rounded; the inner distal angle exca- 

 vate for the reception of the small three-jointed palp. The inner lat- 

 eral margins of the ischium and merus are heavily fringed with setae. 



The female abdominal belt is seven-segmented, the first segment 

 being extremely narrow, hinge-like ; the belt is broadly oval, the lat- 

 eral margins of the different segments distinctly separated; the fifth 

 and sixth segments much longer than those preceding ; the seventh seg- 

 ment is small, triangulate. 



The adult male abdominal belt is triangular, five-segmented; the 

 first segment is very short, hinge-like ; the second and third segments 

 are the widest of the series, each with a transverse median carina, the 

 lateral margins sharply separated ; the third, fourth and fifth segments 

 are completely fused, forming one long segment ; the sixth segment is 

 not quite as long as this fused segment ; the seventh segment is small, 

 triangular. 



The chelipeds of the male are decidedly longer than those of the 

 female ; they are slightly unequal in both sexes. Each has the merus 

 three-sided, armed on the anterolateral margin with five teeth, with a 

 small tooth at the postlateral angle ; the carpus is armed with teeth ; 

 one at the inner basal angle, one smaller at the outer distal angle ; the 

 palm has an acute, sub-basal tooth opposite the median distal angle 

 of the carpus. The propodus is about one-fourth longer than the 

 merus, the palm and fingers being of subequal length; there are five 

 carinae on the outer face of the palm, one along the upper margin, a 

 smaller carina immediately below this, a very strong median carina, 

 another halfway between this and the lower margin, which has a 

 carina continuous to the tip of the lower finger. The upper finger has 

 three strong carinae, separated by deep grooves on the outer face, 

 and three carinae on the inner face; the cutting edge of the right 

 claw is armed with a very large, sub-basal tooth, followed by a series 

 of substantial triangulate teeth, smaller ones alternating between the 

 larger ones. The lower finger has two carinae on each the outer and 

 inner face and is similarly toothed; the tips of the fingers are de- 

 cidedly curved upon each other. The left or smaller claw is similar 

 to the larger one but less robust. The upper and other surfaces of 

 the chelipeds are granulate and finely pubescent, like the body. 



The three pairs of ambulatories are slender, similar, successively 

 decreasing slightly in length posteriorly. There are two longitudinal 



