Boone, Crustacea, Cruise of ''Alva," 1931 19 



the outer branch of the uropoda, separated by a wide sinus from the 

 inner angle which is a shorter, curved, attenuated triangle, about as 

 long as the inner blade of the uropoda. The outer blade is very- 

 strong, with a decided median dorsal longitudinal carina, the outer 

 lateral margin thickened and curved, with ten acute, articulated 

 spines, that increase in length from the proximal to the distal one; 

 this distal spine being twice as long as the next adjacent one. The 

 distal article of the outer blade is small, not as long as the above- 

 mentioned tenth spine, suboval, with the inner lateral margin convex, 

 the inner lateral margin concave proximally distally confluent with 

 rounded outer margin. The entire margin is crenulate and setose. 

 The inner blade of the uropoda is narrowly elongate ovate with the 

 entire margin crenulate and setose. These setae of the caudal fan are 

 web-like. 



The eyestalk is short rounded distally; the cornea is large spher- 

 ical, of about the same diameter as the distal end of the stalk, set 

 obliquely terminal with the inferior surface restricted. 



The antennulae have the peduncular articles clavate, subequal, the 

 distal article slender, extending almost its entire length beyond the 

 eyes; the upper flagellum is slender, about three times as long as the 

 distal peduncular article, composed of fine rings. The longer branch 

 of the lower flagellum is subequal to the upper branch, the shorter 

 branch is thicker and only half so long. 



The antennae have the peduncular article short and wide, with a 

 spine at the outer distal angle; the acicule is leaf -shaped, acuminate 

 and has a distinct median dorsal carina ; the second and third pedun- 

 cular articles are slender, subequal, clavate, the flagellum quite 

 tapered and long, consisting of 38 rings. The scaphocerite is about 

 three-fifths as long as the carapace, narrowly oval, with the distal end 

 evenly rounded, the margins fringed with long setae. 



The first maxillipeds are leglike, slender, with the propodus lami- 

 nate, suboval, the dactyl short, curved, acuminate, closing upon the 

 ciliated convex margin of the propodus, claw-like. 



The second maxillipeds form the retrochela ; the ischium is strong, 

 the merus is about as long as the carapace and quite thick, its upper 

 margin is convex proximally, concave distally, the outer surface 

 moderately rounded, the lower lateral margin nearly straight for the 

 greater part of its length, and truncated distally ; the carpus is small, 

 the upper surface rounded ; lateral profile triangulate, with the distal 



