Boone, Crustacea, Cruises of ''Eagle" and ''Ara/' 1921-28 45 



eyestalks are large, cylindrical, five-sixths as long as the precervical 

 part of the carapace, with an irregular line of hairs on the upper 

 margin, the cornea hemispherical, of slightly greater diameter than the 

 stalk, composed of many fine facets, shining black. 



The antennulae, when extended, have the distal peduncular article 

 about one millimeter longer than the cornea; the proximal joint is 

 short, the second and third peduncular articles are clavate, laterally 

 compressed, almost equal; the two-branched flagellum has the supe- 

 rior branch multiarticulate, slightly longer than the third pedunculate 

 article; the lower branch is very setose, about as long as the last pe- 

 dunculate article. 



The antennae are very slender, about two and one-half times the 

 length of the eyestalk; the peduncular first joint is produced to an 

 acute tooth on the inferior lateral margin and supports the acicule on 

 the upper; the acicule is triangular, very tapering, with a row of 

 spinules on each lateral margin, the tip extending slightly outward 

 and as far forward as the base of the antennal flagellum. 



The external maxilliped is long, the meral article has its inner lat- 

 eral margin armed with a row of spinules; the three- jointed palp is 

 thick and set with short bristles. 



The chelipeds are slightly unequal, the left being the larger; the 

 merus extends about as far forward as the cornea and is laterally 

 compressed with the upper distal margin serrulate ; the carpus is tri- 

 quetral, elongate, the upper and outer faces being wider distally, 

 about equal to tlie palm in width ; the inner lateral margin is armed 

 with a row of spines, and the entire upper face is covered with spin- 

 ous granules; the palm is not quite as long as the carpus, with the 

 inner lateral face wide, at right angles from the outer face, which is 

 scarcely at all convex, slightly oblique and entirely paved with spinu- 

 lose granules, which form a row of spinules along the inner and less 

 so along the outer lateral margins; the propodal finger is about as 

 long as the palm and similarly granulose, with the outer margins 

 spinulose, the tip meeting that of the upper finger, their marginal 

 contour rounded. The hinged finger is similar to the propodal finger 

 but not quite so thick ; both have the cutting edge finely denticulate, 

 the tip corneous, that of the upper finger with an acute horny tooth ; 

 a fine fringe of cilia below the teeth. 



The first and second ambulatories are longer than the great cheliped 

 and are subequal to each other, and those of the right side are sub- 

 equal to those of the left. The ischial joint is elongated, the meral 



