Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 65 



the telson is long, tapering, triangulate, with the lateral margins 

 carinate, ciliated, the tip acute, the dorsal surface very convex trans- 

 versely ; there are two brief, longitudinal submedian lines on the base 

 of the telson. The uropoda have the peduncle rectangular, twice as 

 long as wide, the blades oval, approximately as long as the peduncle, 

 almost subequal to each other, the outer blade is not quite as wide as 

 the inner, which is nearly two-thirds as wide as long, both with 

 ciliated margins. 



The eyestalk is long, slender, curved, extending to midway the dis- 

 tal peduncular joint of the antennae ; the basal joint lies in part of the 

 sinus between the rostral and subrostral teeth and is covered by a 

 hard, calcareous deposit ; the second article is semiconcealed ; the third 

 article has a small, cylindrical base beyond which it narrows into the 

 long, exceedingly slender eyestallv that measures 6 mm. long and is 

 tipped distally with the cornea, which is of slightly greater diameter 

 than the stalls 



The antennulae have the proximal joints lying side by side beneath 

 the rostrum; the large acicule lies beside the under side of the distal 

 peduncular article and extends a little beyond it. The acicule has the 

 upper and lower margins converging, tip rounded, setiferous, outer 

 face convex. The distal peduncular article is thick, cylindrical; the 

 larger branch of the flagellum is thick, setiferous and consists of 42 

 tapering rings; the shorter branch consists of 19 longer but stocky 

 rings and is almost as long as the upper branch; both have a dense 

 fringe of setae along the entire upper and lower under margins. 



The antennae have the acicule large, convex on the outer surface, 

 tapering to an acuminate point distally and with another acuminate 

 point subdistally on the upper lateral margin; the proximal joint is 

 semiconcealed beneath the acicule; the second joint is short, bulbous, 

 convex on the upper surface; the third article is elongate, narrowed 

 proximally, becoming wider, subcylindrical distally; the flagellum is 

 about 20 mm. long and is composed of numerous extremely short 

 rings and has a dense comb of long and short thick setae along the 

 under margin. 



The external maxillipeds have the ischium greatly enlarged, forming 

 an operculum, its length one and four-fifths times its greatest width 

 with the inner margin convex, the article narrowing distally, its inner 

 angle triangular ; the merus is very small, squarish, with the corners 

 rounded; the palp is two-jointed, very long, narrow and curved 

 slightly, with the margin heavily fringed with setae. 



