218 Bulletin, Yanderhilt Marine Museum, Vol. II 



first joint of the palp, which is dilated distally, lays above the distal 

 margin of the merus, while the second and third joints of the palp 

 are directed downward along the inner margin of the merus and 

 ischium; the second joint is smaller and is only about two-thirds the 

 length of the first, while the third joint is very slender, tapering and 

 slightly longer than the first. The outer surface of the ischium and 

 merus are coarsely granulose and sparsely set with short setae; the 

 inner margin of the merus and ischium are thickly fringed with 

 longer setae, the two distal joints of the palp bear a long, heavy brush. 

 The lateral and frontal sides of the carapace are coarsely denticulate. 



The male abdomen consists of seven segments. 



The female abdomen consists of seven segments, the first to sixth 

 inclusive successively increase in length, the fifth being nearly twice 

 the length of the fourth and the sixth twice the length of the fourth ; 

 the seventh is very small, triangular. The second to fifth segments, 

 inclusive, each bear a pair of biramous appendages. Each appendage 

 consists of a short peduncular article, a long, curved, fringed outer 

 branch and an inner branch consisting of a long, basal article directed 

 diagonally towards the center and a distal branch which lies along the 

 median line and consists of a long base and ten or twelve articulated, 

 or semiarticulated annulations distally ; the inner blade is also fringed 

 with long setae. 



The chelipeds are conspicuously unequal in both sexes. Both cheli- 

 peds are much shorter than the ambulatories. The first three articles 

 are small, the merus of the large chela is three-sided with both ventral 

 margins decidedly denticulate ; the carpus is short, convex outwardly, 

 with a pronounced spine on the inner margin; the propodus is high 

 with the distal parts deflected, its outer surface is squamously tubercu- 

 late, the lateral edges, including those of the fingers, are serrate ; the 

 fingers are similar, subequal, traversed by two longitudinal carinae, 

 the cutting edges not quite meeting except at the tips, and serrate with 

 small teeth, the tips acuminate, slightly curved. The larger chela has 

 a stridulating ridge that is composed of fourteen to sixteen tubercles 

 and is not quite half as long as half of the greatest width of the palm. 

 This ridge plays against a smooth carina on the distal part of the 

 upper anterior margin of the ischium. 



The ambulatory legs are quite long and have the upper surface 

 reticulated ; the meral joints are the longest and are rather broad, with 

 the anterior margin finely carinate and serrate; the carpus is about 

 half as long as the merus and much slenderer ; the propodus is about 



