Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 149 



apex truncated and armed distally with four pairs of articulated 

 spines, the outer pair of which are the thicker ; there are two pairs of 

 articulated, short, blunt spines, the proximal pair placed midway the 

 length of and near the lateral margin, the second pair about half- 

 way between that and the distal margin. The caudal fan has both 

 blades of the uropoda longer and wider than the telson, the inner 

 blade being a very little longer and about one-fourth narrower than 

 the outer blade ; both are broadly oval, with only a brief fringe of cilia 

 distally. 



The antennulae have the first article elongate and flattened, slightly 

 concave dorsally, with a leaf-like process on the outer lateral margin 

 and not quite as long as the rostrum; the second article is short, 

 cylindrical, nearly as wide as long, reaching to or half a millimeter 

 beyond the rostral tip; the third article is subequal to the second 

 article; the flageilum is biramose, the thicker branch consisting of 

 about ten stocky rings, which are heavily setose on the lower surface. 

 The slender branch consists of twelve to fifteen rings and is not much 

 longer than the thicker branch. 



The antennae have a short peduncular article; the scaphocerite is 

 oval, exceeding the length of the peduncular article by about the 

 length of the third article, and its median width is equal to half its 

 length, the distal margin evenly rounded and only slightly ciliated. 

 The carpocerite is very slender and cylindrical, extending only two- 

 thirds the length of the scaphocerite and being of only slighter greater 

 diameter than the flageilum, which is tapering, two and one-half times 

 as long as the scaphocerite. 



The eyestalk is stocky, cylindrical, two-thirds as long as the rostrum, 

 beneath which it lies, the cornea small, terminal, of slightly less diam- 

 eter than the stalk. 



The first legs are very slender, chelate, the merus elongated, flat- 

 tened; the carpus slightly longer than the merus, cylindrical, but 

 much narrower basally than distally; the propodus, including the 

 dactyl, is only three-fourths as long as the carpus, the palm is cylin- 

 drical, of about the same diameter as the distal half of the carpus ; the 

 fingers are about as long as the palm, the cutting edges meeting. The 

 entire length of both fingers are set with bristly clusters of setae. 



The second legs are markedly unequal, the left claw being much the 

 larger ; both claws lying in the bent position characteristic of members 

 of the genus. The female has the merus short, less than one-third the 

 length of the palm, as wide as long, with the lower distal margin 



