Boone, Crustacea, Cruise of "Alva," 1931 171 



the cornea ; the second tooth about midway the cornea ; the third 

 tooth slightly beyond the distal margin of the cornea ; the fourth 

 tooth midway between the third tooth and the apex. The first 

 three teeth are almost subequally spaced, the fourth tooth being 

 slightly closer to third, also to the apex, than the other teeth are 

 to one another. On the ventral margin this rostrum is convex 

 toward the distal end and serrated by two rather close-set teeth, 

 one each approximately opposite the upper distal two teeth. There 

 is a very slight carina on the lateral surface of the rostrum which 

 posteriorly is continuous with the lateral margin of the widened 

 triangulate area of the rostrum and beyond this with the orbital 

 margin, which on its outer half becomes depressed in relation to 

 the wide, crescentic concavity that exists here on the dorsal sur- 

 face of the carapace behind the outer half of the orbit, and thence 

 forward along the frontal margin and adjacent carapace to the 

 antennal spine, which is strong, acute, not quite attaining the 

 frontal margin but outward and forward-directed with the apex 

 extending beyond the frontal margin, also with a much smaller, 

 similar shorter spine behind and outside of this. Outside of these 

 two spines the frontal margin of the carapace is evenly rounded, 

 the extreme anterolateral margin being rounded and closely ap- 

 pressed to the carapace. The abdomen is 6 millimeters long and 

 appears dwarfed in comparison with the stout carapace. The 

 abdomen is closely compressed laterally and tapered posteriorly, 

 the first, second and third segments being much wider and stouter 

 than the fourth, fifth and sixth segments; the third segment is 

 much prolonged and rounded posteriorly in the median region; 

 the fourth segment is quite short ; the fifth segment intermediate 

 in length between the fourth and sixth segments; the latter is 

 two-thirds as long as the telson, which is very narrowed, dorsally 

 rounded, tapered distally, truncate, with but very little convexity 

 and setose ; the dorsal surface bears two pairs of articulate spines, 

 one spine of each pair, on each lateral margin of the distal half 

 of the telson. The uropoda have the peduncle short, distally bifur- 

 cate ; the blades are about one-fourth longer than the telson, nar- 

 rowly, regularly ovate, the distal margins finely crenulate and 

 ciliate; the outer blade is the wider and bears a subdistal spine 

 on the outer lateral margin. 



The eyes are large, set upon a stout stalk. 



The antennulae have the basal article thin, laminate, with an 



