Boone, Crustacea, Cruise of "Alva," 1931 149 



not quite subcircular, being more elliptical and wider trans- 

 versely. The carapace is smooth, microscopically regularly setose. 



The stylocerite is slender, acuminate, with the sides not at all 

 convex, the apex reaching four-fifths of the length of the peduncu- 

 lar article of the antennulae. The antennulae are short with the 

 dorsally visible portion of the first article about four-fifths as 

 long as the second article ; the second and third articles are sub- 

 equal, nearly as wide as long ; the inner branch of the flagellum is 

 slender, about one and one-half times as long as the carapace; 

 the outer branch (which is broken) has the proximal portion 

 characteristically thickened for a distance equal to three-fourths 

 of the peduncle and beset with close, short setae. 



The antennae have the basicerite rather heavy, with a spine at 

 the inferior outer distal angle; the carpocerite is cylindrical, 

 about three and one-half times as long as wide, reaching almost to 

 the distal margin of the second article of the antennular peduncle, 

 or not quite so long, by about 1 millimeter as as the inner portion 

 of the scaphocerite ; the scaphocerite is very short, reaching only 

 half-way the distal peduncular article of the antennae and has 

 the inner distal portion widely rounded, the outer distal margin 

 terminating in a sharp tooth ; the inner distal and lateral margins 

 fringed with long cilia; the width of the scaphocerite is three- 

 fourths of the length. 



The abdominal segments are very compressed laterally; the 

 epimera are rather regularly truncate on the lateral margins, the 

 body having a very compact, slender, subcylindrical appearance, 

 neatly tapered posteriorly ; the sixth segment is one and one-half 

 times as long as the fifth segment, or two-thirds as long as the 

 telson, which is rounded dorsally, armed with two pairs of articu- 

 lated spines ; the first pair of these are placed about mid-way the 

 telsonic length ; the second pair are about half-way between the 

 first pair and the distal margin ; the distal margin is about half 

 as wide as the proximal border, abruptly, squarely truncate, armed 

 with a pair of acuminate spines, one at each angle, each spine 

 triangulate, two-thirds as long as the distal border of the telson, 

 which is heavily setose. The telson is almost as long as the inner 

 blade of the uropoda, and nearly as wide distally. 



The large great cheliped is regrettably missing. The small 

 first cheliped is compact, short, reaching not quite so far as the 

 distal margin of the scaphocerite and only a trifle longer than the 



