Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 23 



long as the upper flagellum, while the lower whip is about equal to the 

 upper flagellum. 



The outer antennae have the basal peduncular article thick, knobbed, 

 with an acuminate tooth at the inner distal angle ; the scaphocerite is 

 narrow, elongate-ovate, with ciliated margins; the second and third 

 peduncular articles are slender, clavate, the flagellum is composed of 

 28 articles and extends about as far forward as that of the inner 

 antennae. 



The first maxillipeds are slender, thin, leg-like, terminating in a 

 small, unequal-sided, ovate article that bears a thick brush of bristly 

 setae on its outer and distal margin. 



The second maxillipeds form the great retrochela; the merus is 

 greatly elongated, with its upper surface smooth, convex, its superior 

 lateral and posterior margins rounded, the distal two-thirds of the 

 lower lateral margin excavate for the reception of the reflexed pro- 

 podus ; the carpus is short, smooth, convex ; the propodus is two-thirds 

 as long as the merus, with the proximal three-fourths slightly nar- 

 rower than the distal end, which is rounded externally; the lower 

 lateral margin of the propodus is grooved for the reception of the 

 dactyl; the dactyl is thickened, externally convex for the proximal 

 third of its length, then forms a slender, rod-like blade with the tip 

 very curved ; the cutting edge is very finely denticulate. 



The third maxillipeds and first and second thoracic legs are similar, 

 subequal, each with a sublobate exopod at its base; the ischium is 

 greatly elongated, slender, arched, the merus is short, outwardly thick, 

 its inner lateral margin produced into a laminate, convex lobe; the 

 carpus is small, wider distally, its outer lateral margin bristly, it and 

 the propodus reflexed upon the laminate process of the merus; the 

 propodus is laminate, roughly suboval, the outer margin more convex, 

 the inner margin with its proximal angle bluntly rounded, its margin 

 thickly set with bristles ; the dactyl is slender, curved and folds upon 

 the lateral margin of the propodus. 



The third, fourth and fifth thoracic legs are weak and fragile, each 

 with an epipodite ; the distal joint is set along its outer, rounded mar- 

 gin with 8 to 12 articulated spines of unequal length and there are sev- 

 eral more of these at the distal end of the preceding article. 



Five pairs of strong, biramous pleopoda arise from the respective 

 abdominal segments. 



