142 Bulletin Vanderhilt Marine Museum, Vol. V 



The antennae have the basal article quite large, extending ob- 

 liquely outward and upward into the space between the frontal and 

 orbital angle. The fiagellum is slender and is situated in the orbital 

 hiatus. The external maxillipeds are smooth, except for a prominent 

 longitudinal groove on the ischium ; the anterior margin of the merus 

 is almost transverse; the tip of the palp is finely setigerous. 



The chelipeds are moderately unequal ; the merus elongate, extend- 

 ing one-half its length beyond the margin ; triquetral, with both inner 

 and upper lateral margins irregularly denticulate, and both upper 

 surfaces coarsely granular, the more conspicuous granules being 

 arranged in a roughly longitudinal series. The carpus is rounded 

 and broken by about ten to twelve conical lobules, and with the inner 

 angle conspicuously produced and with a bifid tip. The palm widens 

 distally and has the upper half of the inner surface, and practically 

 all of the outer surface covered with numerous coarse conical 

 granules, those on the outer surface being well-spaced longitudinal 

 rows, the upper two rows being much larger than those lower down on 

 the palm. The fingers are black, this color forming a conspicuous 

 patch on the inner surface of the palm, behind the upper half of the 

 lower finger. The fingers are curved with deeply hollowed tips and 

 moderately toothed cutting edges. 



The ambulatories are well developed, the merus has one row of 

 sharp, curved spines on the upper margin. The carpus has three rows 

 of similar spines and the propodus has two rows of acute spinules; 

 the dactyl is strong with a curved tip. The male belt is five-segmented. 



The ten young adults, at first glance would appear to be a differ- 

 ent species, owing to the fact that they have the spines of the antero- 

 lateral margin more conspicuous in proportion to the size of the cara- 

 pace, and the three hepatic branchial, conical lobules of the larger 

 specimens are represented by three long acute spines. On the 

 chelipeds, the granules of larger adults, on the merus, carpus, and 

 propodus, are represented on these young specimens by coarse 

 pointed curved, or straight, conical spines, arranged as are the gran- 

 ules on the larger specimens. The spinules along the upper margin 

 of the merus, carpus, and propodus are also longer in proportion to 

 the related legs than is true of other specimens ; but the serial arrange- 

 ment of the respective joints is the same. The setae of the legs are 

 much longer, also as is customary in young crabs. 



Two of the above described young adults measure as follows : Male : 

 — Carapace, 7 mm. wide, 5 mm. long ; Female, carapace, 6.5 mm. wide, 



