Boone, Crustacea, Cruise of ''Alva," 1931 87 



bilobate and extending farther forward than the lateral lobes which 

 are separated from the median lobes by a deep notch. The orbital 

 margin is thickened but less so than the frontal margin and the ex- 

 ternal orbital angle is bluntly rounded and but little in advance of the 

 thickened anterolateral margin which is widely convex ; there is a con- 

 spicuous blunt tooth at the lateral angle ; the postlateral margins are 

 decidedly convergent. The ground color of the carapace and upper 

 surface of the legs is deep creamy and light orange red, marked with 

 eleven or more vivid carmine, rounded spots, arranged two on either 

 side, immediately behind the eye, along the anterolateral border, the 

 smaller spot including the orbital angle; three large spots in trans- 

 verse curved series across the middle of the carapace and a curved 

 transverse series of four smaller spots across the hinder portion of the 

 carapace, near the posterior margin. The orbital margin is entire. 

 The cornea is set obliquely terminal, on a thick calcareous stalk. 



The male belt is tapered and consists of six articles ; the third and 

 fourth segments being fused. The female belt is broadly oval, seven- 

 segmented, the sixth and seventh segments each being much wider than 

 those preceding. 



The antennulae are separated by a broad septum; they fold ob- 

 liquely, nearly transversely. 



The antennae have the peduncle large, elongate, projecting into the 

 cleft between the frontal margin and the infra-orbital plate ; the flagel- 

 lum is small, also situated in this cleft and extending less than a milli- 

 meter beyond. 



The external maxillipeds are very close-fitting with the anterior 

 margin decidedly oblique. 



The chelipeds are conspicuously unequal in both males and females, 

 in about the same degree of difference, as shown in plates 39 and 

 41. They are smooth, the carpus rounded; the propodus of the 

 larger cheliped very massive, equal in height to slightly more than 

 half of the length of the carapace; the fingers are curved; the upper 

 and lower each having one powerful molar ; the finger tips have blunt- 

 ish points. The smaller cheliped has no gape but a fairly definite 

 thickened cutting edge. 



The ambulatories are long, slender, smooth, subcylindrical, with 

 powerful, curved, tapered dactyli, each of which has a longitudinal 

 groove on both the anterior and posterior surfaces and a sharp, strong, 

 brown tip. 



