Boone, Crustacea, Cruise of "Alva," 1931 161 



The eye is short-stalked, this stalk being entirely concealed 

 beneath the carapace-rostral region ; the cornea is hemispherical, 

 large, not projecting beyond the rostrum and closely surrounded 

 on the upper and outer surfaces by the carinate border of the 

 carapace. 



The antennulae have the first peduncular article laminate, flat- 

 tish beneath the eye, the visible portion being about twice as long 

 as wide, or as long as the second and third articles considered 

 together ; the second article is short, cylindrical ; the third article 

 similar to the second but slightly shorter; the entire peduncle is 

 three-fifths as long as the scaphocerite ; the shorter flagellum con- 

 sists of ten thick, fleshy articles, each about as long as the third 

 peduncular article and following these a slim whip consisting of 

 five or six smaller articles ; on the inner and distal margins of the 

 distal ten articles there is a brush of setae ; the longer flagellum 

 is also thick, composed of about eighteen setose articles, the distal 

 seven or eight of which extend beyond the scaphocerite. 



The antennae have the first peduncular article compact, the 

 second article short, the third article elongate, cylindrical, extend- 

 ing almost three-fifths of the length of the scaphocerite ; the flagel- 

 lum is 4 millimeters long, or one and one-third times as long as 

 the entire carapace. The external maxillipeds are pediform and 

 extend as far as does the tip of the second pair of legs ; the distal 

 article is cylindrical proximally, tapered conically, distally, and 

 rough with bristles set in transverse series, those near the apex 

 being especially hook-like; the exopodite is slender and reaches 

 almost to the basal article of the endopodite. 



The mandible has a two-jointed palp. 



The first chelipeds are weak, the apex of the tips extending as 

 far as does the tip of the rostrum, or to the base of the fingers of 

 the second chelipeds, which are similar. 



The second pair of chelipeds is the longer, somewhat oper- 

 culiform, extending to about midway the distal peduncular joint 

 of the antennae ; the merus is extremely slender, elongated, lateral- 

 ly compressed, transparent ; the carpus is no wider than the merus 

 and is about one-fourth as long; it terminates obliquely, rein- 

 forcing the support to the propodus, which, including the finger, 

 is a little more than twice as long as the carpus, expanded into a 

 slight convex contour on the outer lateral margin, weakly chelate 

 for the distal half of its length, the apex forming a slight curved 



