Boone, Crustacea, Cruise of ''Alva," 1931 183 



fused and forming about three-fifths of the broad oval, which is com- 

 pleted by the successively narrowed sixth and seventh segments. 



The eyes are large, the cornea set obliquely terminal ; the eyestalk 

 with a calcareous covering that projects slightly upon the cornea dor- 

 sally. 



The antennulae are strong and fold almost vertically within the 

 sulcus; the distal end of the peduncular joint and adjacent proximal 

 end of the second joint are curiously flattened and have the margins 

 rounded and fringed with setae ; the remaining joints are fleshy. 



The antennae have the basal joint flattish, wider than long, each 

 distal angle produced into a prominent tonguelike lobe ; the outer one 

 tipped with two spines and the inner lobe with one spine ; the second 

 article is stocky, twice as long as wide, with its inferior face deeply 

 channeled and outer distal margin with a spine and the inner lateral 

 margin with three or four spines, one of which is distal, also a distal 

 brush of setae ; the third article is small, the flagellum of about fifteen 

 tapered articles, with a total length about equal to the length of the 

 second peduncular article. 



The external maxillipeds are large, close fitting, with the ischium 

 quite large, subrectangular, its distal angle nearly right-angled; its 

 width scarcely two-thirds its length ; the merus is small, distinctly nar- 

 rower than the ischium and set obliquely upon it ; the palp is rather 

 long, slender, tapering and furnished with spinose setae, as is also the 

 inner lateral margin of the ischium and merus. 



The chelipeds are of moderately unequal size in the large male, 

 but are equal in the female ; the merus is three-sided, projecting about 

 three-fourths of its length beyond the carapace, armed along the upper 

 lateral margin with a series of acute spines and with a strong subdistal 

 spine at the outer lateral angle, a single acute, subdistal spine at each 

 the upper and inner distal angles; the carpus is rounded and has a 

 strong, acute spine proximally and another subdistally at its outer 

 margin, between these and on the upper surface of the carpus; there 

 are eight or ten acute, upward pointing spines, some of which are con- 

 cealed beneath the dense pilosity that covers the upper outer surface ; 

 the palm is smooth, suboval, three-fourths as high as long with the 

 outer and inner surfaces each slightly convex, the inner margin lightly 

 carinated, the fingers are short, deflected, with horny, spoon-shaped 

 tips. There is a dense pilosity on the entire surface of the exposed por- 

 tion of the inner face of the merus, carpus, and a longer oval patch on 

 the upper proximal portion of the inner surface of the palm. 



