14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



the clenticulations arming the ventral margin of the ischium is larger 

 than that in the type of the typical species, heing nearly half a milli- 

 meter long. 



The smaller cheliped is not much different from that of the type of 

 the species proper, the fingers are more slender and the hand more 

 triangular ; the tip of the movable finger is also wanting. 



The smooth, blunt ridge on the inner face of the ischium of the 

 third maxilliped (pi. 2, fig. 7) appears unarmed or unadorned; only 

 by careful inspection, and then with a glass, can five little scales or 

 tiny, scarcely perceptible, well-separated, flattened spines be observed 

 in line on the proximal third of the ridge. 



Next to the differences from the typical specimens in the large chela 

 and fingers, those found in the telson and the uropods are the most 

 marked. The telson is even more rectangular-appearing than that of 

 the type of the species, as the lateral angles are not so broadly rounded 

 and the hinder margin is more truncate or straight ; it is, however, like 

 that type in being about one and one-third times as wide as long, and 

 contained in the length of the sixth abdominal somite about twice ; the 

 telson is transversely evenly, though shallowly, convex, flatter than in 

 the typical species, but unlike it, has the median longitudinal con- 

 vexity interrupted by a not inconspicuous depression just before the 

 hinder margin ; the inner uropod measured as in the type of the species 

 proper is but one and one-half times as long as wide ; the basal segment 

 of the uropods is armed with a low, blunt, triangular spine, and in 

 place of the conspicuous spine on the proximal margin of the outer 

 blade of the typical specimens there is an inconspicuous, low tubercle ; 

 no fine impressed line appears across the middorsal region of the telson 

 parallel to and a little before the basal margin ; there is a short, not at 

 all well-marked, shallow, transverse depression on either side of the 

 midline, but not crossing it ; these two inconspicuous depressions are 

 well separated from one another transversely and are in no way like 

 the very definite fine line of either of the typical specimens, which very 

 distinctly crosses the middorsal line of the telson. 



The differences are such as one might expect, in part at least, be- 

 tween male and female specimens, but I can find no evidence that any 

 of the specimens are female. True enough, the type retains but one 

 basally much mutilated third leg, but there are in the other two speci- 

 mens no traces of external female apertures, and the first pleopods of 

 all three are of the same masculine character. 



This varietal specimen measures (in millimeters) approximately 68 

 long, carapace and rostrum 16, abdomen and telson about 52; telson 

 alone about 4.9 long by a shade over 6 wide. The large chela, measured 



