52 Bulletin Vanderbilt Marine Museum, Vol. VI 



long and with a small distal spine at both the inner and outer 

 lateral angles ; the flagellum is thread-like, composed of forty-five 

 to fifty rings, each bearing a tactile setum at its outer margin, 

 the whole exceeding the chelipeds in length by almost the length 

 of the dactyli. 



The chelipeds are subequal, about 10 millimeters long, or 

 slightly longer than the body; the ischial joint is strong, termi- 

 nating in an acute tooth at the lower distal angle; the merus is 

 dilated distally with the lower surface granulose and the upper 

 surface spinose; a particularly long spine occurs at the inner dis- 

 tal angle ; the carpus is two-thirds as long as the merus, dorsally 

 rounded and with four approximately longitudinal series of spines, 

 the outermost of which are lateral ; there is a long acute spine at 

 the inner carpal angle; the propodus has the palm only a trifle 

 longer than the carpus, dorso-ventrally flattened, slightly wider 

 than the carpus, with both lateral margins spinose with coarse, 

 sharp spines, the lateral series continuous along the outer mar- 

 gins of the dactyli, and especially strong on the lower dactyl. The 

 lower dactyl has a single large tooth and the upper dactyl has 

 large, bifid tooth. Abundant long, solitary setae occur on the inner 

 dactylar margins, forming a crude sieve. The upper, and especial- 

 ly the lateral, surfaces of the carpus, propodus and dactyl are 

 also set with numerous long, solitary setae. In the females the 

 chelipeds have the gape less wide but constant. 



The ambulatories are slender, the first pair not quite extend- 

 ing to the base of the dactyl of the cheliped, and the second and 

 third pairs of legs successively decreasing in length by approxi- 

 mately the length of the dactyl of the preceding pair. Each leg 

 has the merus elongate, compressed cylindrical, banded by trans- 

 verse ridges and with the lower, and especially the upper, lateral 

 margins spinose ; the carpus is about one-half as long as the merus, 

 dilated distally and similarly spinose along the lateral margins; 

 the propodus is slenderer, more compressed, about twice as long 

 as the carpus, with the upper margin spinose ; the dactyl is little 

 over half as long as the propodus, with a strong curved tip, aug- 

 mented by a subdistal spinule on the inferior margin. The carpus, 

 propodus and dactyl have numerous long, solitary setae on the 

 upper surface. 



The fifth pair of legs are slender, smooth, reflexed. 



