58 Bulletin, Vanderhilt Marine Museum, Vol. II 



enth segment is a small elongate triangle with the distal margin 

 rounded. 



The male abdominal belt is a narrow, elongate triangle, the first and 

 second segments hinge-like; the third, fourth and fifth segments are 

 completely anchylosed; the sixth segment is one-half as long as the 

 preceding segment, the seventh segment is three-fifths as long as the 

 sixth and rounded at the tip. 



The frontal region in orbicularis has a distinctly shallower median 

 depression and its frontal margin is much less produced in the median 

 line than that of punctata. The pre- and postorbital angles are also 

 more heavily, bluntly rounded than those of punctata. Three closed, 

 linear sinuses occur on the upper orbital margin, between the angles. 



The eye is small, the cornea terminal, shining black, not projecting 

 beyond the orbital margin which is heavily fringed with close-set 



S61;R6a 



The antennulae are well developed and fold horizontally beneath 

 the orbital border in the fossett ; the first and second articles are large, 

 subequal, cylindrical; the flagella are much reduced and furnished 

 with a brush of setae. 



The antennae are much reduced and are situated in the infra-orbital 

 sinus. 



The close-fitting external maxillipeds, depicted in plate 11, have 

 the distal margin of the exognath more bluntly triangulate at the tip, 

 while in punctata it is rounded ; there is a decided longitudinal groove 

 near and approximately paralleling the inner margin of the meral 

 and ischial joints of the endognath and outside it a very definite sub- 

 median, longitudinal line or brush of setae; outside this brush and 

 subparallel to it is a row of large granules. 



The chelipeds are much longer in the male than in the female, slen- 

 der, the merus being subcylindrical, two-fifths longer in the male than 

 in the female, densely granulose ; the carpal joint is one-fifth as long 

 as the male merus, narrowed basally, dilated distally; the male pro- 

 podus, including the fingers, is a trifle longer than the merus, arcuate, 

 the palm moderately rounded, of equal length with the lower finger, 

 both dorso-ventrally compressed, the hand moderately rounded, the 

 finger tapering, flattish, with a brief but distinct gape at the base, the 

 cutting edge is divided into a series of small, flat, blunt denticles ; the 

 upper finger being curved is slightly longer than the lower and its 

 tip curves down and projects beyond that of the lower finger. The 



