196 Bulletin, Vanderhilt Marine Museum, Vol. II 



the ischial margin. The inner margin of the ischium and meriis are 

 fringed with long, spinose setae which practically cover the space 

 between the opposing maxillipeds, forming a sieve which is augmented 

 by the similar setae on the palp. 



The male abdomen is seven-segmented, narrow, with a triangulate 

 tip. It is well figured in my "Crustacea from Tropical East American 

 Seas," p. 12, figs. 3 and 4, but the latter figure is unfortunately 

 labelled "female" abdominal belt; it should read ''male" abdominal 

 belt. 



The male chelipeds are well developed, almost equal in size. The 

 ischium is short, slender and produced on the anterior-ventral margin 

 to an acute point; the merus is long, three-sided, much broader dis- 

 tally and armed on the inner dorsal margin with an upward pointing 

 spine situated a little distance behind the distal margin, which is pro- 

 duced to a similar but slightly less protuberant tooth at the outer 

 upper edge. There is a conspicuous tuft of close-set plumose setae on 

 the distal upper frontal regions of the merus. The carpus is nearly 

 two-thirds as long as the merus; the propodus is quite large, being a 

 trifle longer than all the preceding segments taken together. It is no 

 wider basally than the carpus and is produced on its upper margin 

 into a smaller tooth-like process at the base. The propodus widens 

 conspicuously, attaining its greatest width at the base of the propodal 

 finger. The outer basal surface of the propodus bears a tuft of setae. 

 It is very convex on the outer surface, but much more inflated on the 

 inner surface. The propodal finger is nearly half the length of the 

 propodus, is triangulate, laterally compressed, marked on its outer 

 surface by a decided longitudinal groove near and approximately par- 

 allel to the central margin. The tip of the propodal finger is strongly 

 upcurved. The inner cutting edge is divided into six teeth. The 

 hinged finger is set obliquely and its cutting edge is in complete appo- 

 sition with that of the propodal finger. It bears two small teeth 

 basally, then a very large, obtuse tooth followed by two small teeth, 

 the finger tip curves downward and crosses upon that of the lower 

 finger. The smaller cheliped differs only in size and in having less 

 prominent teeth along the cutting edge of the finger. 



The ambulatory legs are quite long and slender, the first three pairs 

 are smaller and subequal; the fourth pair is similar in structure but 

 does not quite extend to the tip of the propodal joint of the third leg; 

 the ischium is short and decidedly slenderer. The first legs are sub- 

 equal. The merus is decidedly the longest joint of the limb and is 



