Boone, Crustacea, Cruise of "Alva," 1931 229 



with the maximum width, which occurs slightly above the center, 

 equal to seven-ninths of the length, with the anterior lateral mar- 

 gin broadly rounded proximally, sinuate, nearly straight for the 

 greater portion of its length and broadly truncate, very little con- 

 vex at the distal angle ; the area finely pectinate, a small, tooth- 

 like process distally above the base of the next joint, and beyond 

 this and separate therefrom is the blunt, scarcely rounded pos- 

 terior distal angle. The postlateral margin is very widely ex- 

 panded, convex, attaining its greatest width just above the center ; 

 the second joint is short, not produced beyond the distal border 

 of the first joint; the third joint is convex, with the anterior lat- 

 eral margin pectinate; the fourth joint is shorter than the third 

 but is similarly convex and has the anterior lateral margin pecti- 

 nate ; the propodus is as long as the two preceding joints consid- 

 ered together, slender, with the anterior margin pectinate; the 

 dactyl is not quite one-fourth as long as the propodus, small, 

 acuminate. 



The fifth pair of legs is greatly reduced, concealed under the 

 fourth pair. The first article of the fifth pair of legs is one-fourth 

 longer than the remaining five joints considered together, and has 

 the contour unequally oval, the anterior lateral margin but little 

 expanded and the posterior lateral margin widely expanded, con- 

 vex, attaining its greatest width, which is equal to three-fifths of 

 the length, just above the center; the remaining five articles are 

 small, having the ratio illustrated (PI. 68, fig. H) ; the second joint 

 is short, two-thirds as long as the third joint; the fourth joint is 

 one-half as long as the third; the fifth joint is slenderer, shorter, 

 tapered ; the dactyl is minute, pointed. 



The telson is subequal in length to the coalesced fifth and 

 sixth segments and proximally is ten-thirteenths as wide as long, 

 shield-shaped, with the lateral margins curved, convergent dis- 

 tally to an acute apex, which extends beyond the tip of the inner 

 blade of the third pair of uropoda. (PI. 68, fig. I) . 



The first pair (outermost) of uropoda have the peduncle pris- 

 matic, three-fourths as long as the coalesced fifth and sixth seg- 

 ments, or minutely longer than the related outer branch, which is 

 very slender, distally narrowed, acuminate, with the outer mar- 

 gin nearly straight, the inner one more convex and crenulate ; the 

 inner blade is one-third wider than the outer blade and is nar- 

 rowly lanceolate-acuminate, with the lateral margins about equal- 



