108 Bulletin Vanderbilt Marine Miiseum, Vol. VI 



the distal joint of the antennular peduncle. The flagellum is fine, 

 nearly twice the length of the scaphocerite. 



The external maxillipeds are slender, pediform, when ex- 

 tended, reaching slightly beyond the antennular peduncle; the 

 distal article is three-fifths as long as the preceding joint, tapered 

 distally. Both joints are fringed with coarse, separately set, long 

 setae. 



The first pair of legs (female) is subequal, slender, with the 

 ischial joint slender, slightly longer than the merus, or four-fifths 

 as long as the propodus and fingers considered together ; the merus 

 is four-fifths as long as the ischium, similar ; the carpus is three- 

 fifths as long as the merus, obconic; the palm is similar to the 

 carpus but about one-third longer; the fingers are subequal, as 

 long as the palm, very slender, tapered, with the fixed finger slight- 

 ly the longer and thicker, it being curiously dorsal in position, its 

 very curved, acuminate tip overlapping that of the slenderer hinged 

 finger, which is also acuminate. The cutting edges are straight, 

 meeting throughout their length, that of the lower finger beset 

 with fine, stiff, sieve-like spinules or setae in regular close forma- 

 tion and opposing a similar series on the margin of the opposed 

 hinged finger. 



The second pair of legs is similar to the first, nearly subequal, 

 being only a trifle larger, exceeding the first pair in length by 

 about one-half the length of the fingers of the second pair. There 

 is a long, well developed epipodite on each the first and second 

 pairs of chelipeds, also there is one present on ambulatory legs 

 pairs one and two, while on pair three the epipodite is present but 

 greatly reduced. 



The first pair of ambulatory legs is very weak, slender, and has 

 more the appearance of a degenerate swimmeret than of an ambu- 

 latory leg. They extend to midway the merus of the second pair 

 of chelipeds. The basis of the first pair of ambulatories is stout 

 and has an acute spine ; about 1 mm. long, at the inner distal ven- 

 tral angle, and supports a slender, setose, tapered, acuminate epi- 

 podite, which is 1.9 mm. long; the ischial article is the longest and 

 widest of the series, being 2.5 mm. long, 0.6 mm. greatest width; 

 the ischium has six to eight articulate spines on the inferior lat- 

 eral margin; the merus is distinctly slenderer than the ischium, 

 1.5 mm. long, with four to six articulate spines on the inferior 

 margin ; the carpus is obscure, scarcely 0.5 mm. long ; the propodite 



