Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 167 



as far as the basal peduncular article of the antennulae. Orbital lobes 

 convex, with the frontal margins rounded beyond that of the adjacent 

 margin and armed on the superior frontal margin with an acute, small, 

 forward-pointing spine. Carapace 10 mm. long, or seven-eighths as 

 long as the larger chela, moderately compressed laterally. Abdomen 

 similarly compressed, epimeral region only moderately produced and 

 rounded marginally ; telson one and one-half times as long as its proxi- 

 mal width, distal margin truncated, slightly rounded and heavily 

 ciliated. Uropoda with the peduncle produced to each sharp spine at 

 its outer distal angle; the inner blade oval, slightly longer than the 

 telson, with a median longitudinal keel ; the outer blade a little wider 

 and longer than the inner, with the distal fourth articulated, a black, 

 acute spine at the outer distal angle of the proximal portion of the 

 blade and an oblique ridge on the dorsal surface directed towards this 

 spine ; the extreme distal margin rounded ; both blades heavily ciliated 

 on the distal margin. 



Second peduncular joint of the antennulae about a third longer than 

 the first joint; third article approximately one-half as long as the 

 second ; the shorter branch of the antennular flagellum about as long 

 as the great chela, thickened for its proximal half and heavily ciliated 

 on the inferior margin, the distal portion very fine ; the longer whip 

 about half as long as the antennal whip; the scale lanceolate, pro- 

 duced to an acute spine distally, reaching two-fifths the length of the 

 second peduncular article. 



The antennae have the basal article produced to a spine at its outer 

 distal angle ; the scaphocerite with the scale as long as the antennular 

 peduncle, the lateral spine acute, projecting about a millimeter beyond 

 the scale ; the scale is wider proximally, very narrowed, tapering dis- 

 tally, heavily ciliated. Carpocerite cylindrical, about one millimeter 

 longer than the antennular peduncle ; flagellum slender, about as long 

 as the body. 



The left cheliped is the larger, the propodus slightly longer than 

 the carapace; the merus is laterally compressed, somewhat dilated 

 distally and marginally excavate for the articulation with the basally 

 convex, cup-like carpus, which in turn is concave distally for the recep- 

 tion of the propodus, which is rounded and produced on the inferior 

 proximal margin; the propodus is elongate-ovate, somewhat com- 

 pressed laterally, moderately convex, with an oblique groove on the 

 proximal half of the outer face, ending in an unequallj^ ovate area. 

 There is an acute spine at the inner distal angle of the palm above 

 the base of the propodal finger, which is short, acute, with the tip in- 



