Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 37 



the postlateral lobes convex, tlie median posterior region excavate for 

 the abdomen; the latter is asymmetrically coiled, encased in tough 

 membrane, except the pretelsonic segment which bears a nearly square 

 calcareous plate on the upper surface ; the proximal part of the telson 

 is unequal-sided, about two-thirds as large as the preceding calcareous 

 plate; the distal part is flexed under, unequal-sided, roughly subcir- 

 cular, with the lateral margins with an approximately median incision, 

 the lobes thus formed, rounded; the distal margin incised in the me- 

 dian line, also rounded, the right side smaller than the left. The 

 uropoda are very unequal, the left one being about three times as 

 large as the right; they are of similar shape, with a stout peduncle, 

 which is nodular distally; the outer blade is small, auricular, except 

 that the apex is pointed; the outer margin has a crescentie patch of 

 scales ; the inner blade is twice as long as the outer and very strong, 

 of approximately the same shape distally but witli a longer base prox- 

 imally, also with a crescentie band of scales and a marginal fringe of 

 setae. There are three small appendages on the left side of the abdo- 

 men; each has a slender, slightly curved peduncle, a linear anterior 

 blade about two and a third times as long as the peduncle, the pos- 

 terior blade smaller than the peduncle. 



The ocular scale is small, lobate, the lateral margins convex, con- 

 vergent distally to an acute tip. The eyestalk is short, one-half as 

 long as the precervical part of the carapace, thick, cylindrical, widen- 

 ing distally, the cornea large, spherical, terminal. 



The antennulae are slender, the proximal joint short, the second 

 and third joints slender, clavate, the third longer than the second ; the 

 two-branched flagellum stocky, short, the upper branch with a brush 

 of short cilia; the antennulae extends beyond the eye for a distance 

 equal to two-thirds the length of the eyestalk. 



The antennae have a very long slender flagellum, which extends 

 almost to the tip of the dactyl of the cheliped. The proximal an- 

 tennal joint is short, nearly as wide as long and produced to an acute, 

 triangulate tooth at its outer distal margin, the acicule is slender, 

 slightly bowed, the apex acute, outward directed; the second pedun- 

 cular article is very short, cylindrical, not reaching to midway the 

 acicule; the third article is slightly longer, slenderer, reaching to the 

 tip of the acicule; the flagellum consists of about one hundred an- 

 nulations. 



The chelipeds are unequal, the right one being much the larger. The 

 merus is laterally compressed ; the carpus is as long as the merus and 



