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



Technical DESCRiPiioisr : Carapace suboval, frontal and anterolat- 

 eral margins broadly rounded ; postlateral margins arcuate, converg- 

 ing with lateral border reflexed as a carina. Frontal border produced 

 slightly beyond the internal orbital teeth, consisting of a longer, de- 

 pressed, median tooth and a pair of slightly broader, rounded, sub- 

 median teeth. The orbit is subcircular, suborbital lobe decidedly 

 produced ; two narrow fissures above and two below ; the anterolateral 

 border is divided into nine subquadrangular, crenate teeth, the mar- 

 gins of which are minutely denticulate. Surface of carapace finely 

 granulate; mesogastric-cardiac regions moderately delineated by de- 

 pressions. Under sides of carapace moderately hairy, especially the 

 regions adjacent to the basal half of the legs. The male abdomen is 

 seven-segmented. 



The female abdomen consists of seven segments, the sixth and sev- 

 enth respectively being nearly twice as long as any of the preceding ; 

 margins of all segments fringed with short setae. Eyestalks bulbous ; 

 cornea smaller, shining black. Antennules robust, basal joint broad, 

 second and third joints cylindrical, subequal; flagellum insignificant. 

 Antennae with basal joint moderately expanded, remaining articles 

 slender, tapering. 



Chelipeds subequally enlarged in the male, approximately equal in 

 the female; when relaxed, extending only a trifle beyond the end of 

 the carapace and with the upper margin of the crest of the propodal 

 joint on a plane with the frontal margin. Basis stout, ischium small, 

 almost fused with the long, transversely triangulate merus which is 

 rounded on its outer ventral, and rather sharply carinated its inner 

 and upper longitudinal margins, and also bears a sharp tooth on the 

 latter near the apex, and another tooth at the distal apex. There is a 

 deep groove on each the outer and inner surfaces of the merus par- 

 alleling the distal margin and near to it. The carpus is convex on its 

 outer side, finely granulate and produced on its upper distal margin 

 to a tooth-like apex, below which there is a less prominent tooth ; the 

 propodus is robust, smooth on its inner surface, convex on the outer 

 surface which bears seven longitudinal carinae; the upper three 

 carinae are set with finely spinous tubercles ; the lower three carinae 

 are continued onto the propodal finger, which is stout and armed with 

 seven substantial teeth. The dactylus is stouter basally than the pro- 

 podal finger and has its inner margin armed with six teeth and its 

 outer margin rounded and finely spinulose. The tips of both fingers 



