Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 99 



The eyes are set on short, calcareous stalks which are dorsally 

 spinose; the cornea large, convex, terminal. 



The antennulae have a stocky peduncle, the first and second articles 

 excavate beneath the eye; the distal margin of the first segment 

 expanded and curved over upon the segment ; the third article about 

 as long as the second, stockier and spinose, as is also the upper distal 

 margin of the second joint; the peduncle of the flagellum is one 

 stocky ring, from which arise two slender flagella, of which the inner 

 one, about as long as the body of the animal, is the shorter. The first 

 fifteen to twenty rings of these flagella each have a spinule on the 

 upper surface. 



The antennae have two stocky, spinose peduncular joints, the second 

 of which gives rise to the scaphocerite, which is as long as the carapace 

 measured from the postorbital angle, and narrow, with the lateral 

 margins parallel for the greater part of their length, except for a 

 distinct curve inward of the proximal part of the outer lateral margin. 

 This outer lateral margin is spinose and has a slender subdistal spine ; 

 the apex is convex. There is a pronounced median longitudinal keel 

 which is microscopically spinose. 



The first legs are small, slender, chelate, not as long as the external 

 maxillipeds; when extended forward these legs reach to about mid- 

 way the scaphocerite. The second legs are similar to the first pair, 

 but longer; extending beyond the scaphocerite by about the length 

 of the fingers. The third legs, which are approximately as long, or 

 sometimes in old males longer than the entire body of the animal, are 

 very attenuated proximally, the joints widening distally. The basis 

 and ischium are fragile ; the merus elongated, spinulose, wider a little 

 distally; the carpus not quite as long as the merus, but noticeably 

 wider, armed with about four longitudinal rows of sharp spines which 

 are marginal; the palm is about as long as the carpus, but higher, 

 somewhat compressed laterally; the fingers are about two-thirds as 

 long as the palm and very slender, the tips curved, a sub-basal tooth 

 on each finger. The palm and proximal half of the fingers are mar- 

 gined laterally by a row of sharp spines, and there are two additional 

 rows of spines on each the outer and inner faces of the palm; also 

 numerous long setae on the margin. 



The fourth and fifth legs are very slender, the tip of the dactyl 

 reaching to the base of the merus of the third leg ; monodactyl, with 

 an elongated, multiarticulate carpus, consisting of nine to twelve 

 articles; a propodus about half as long as the carpus and armed on 



