Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 201 



second, three-fifths as long as the first ; third, a little less than second ; 

 fourth as long as second; fifth and sixth slightly longer than the 

 fourth ; seventh slightly less than sixth. Epimera perfectly coalesced 

 with segments, line of fusion wanting ; the lateral parts widely ex- 

 panded and produced distally into an acute roughly triangular process 

 with the apex directed posteriorly. 



Legs: Seven pairs, subequal, strongly prehensile, similar in struc- 

 ture. The first joint strongly produced into a curious wing-like 

 process, which is roughly triangular with acute apex directed outward 

 and posteriorly; this process on the first leg fused with the first 

 thoracic segment, those of second to seventh legs, inclusive, distinct; 

 those of the second and third legs are so produced as to be conspicuous 

 on the dorsal side; the second process equals in length the produced 

 extremity of the second segment ; the third process is slightly less than 

 the extremity of the third segment; the fourth to seventh processes, 

 inclusive, are not visible dorsally; the fourth and fifth are stout and 

 not quite as long as the third ; the sixth is slenderer and longer than 

 the fifth ; the seventh is slender and quite pointed ; the second joint 

 of the leg is very small ; the third joint is the longest with unique basal 

 curvature adapted to the sculpture of the first joint; the fifth is 

 slightly longer than the fourth; the sixth is a strongly curved claw 

 folding over the fifth, with a tip reaching the basal part of the fifth 

 joint. 



Abdomen : This consists of six segments, the first of which is hidden, 

 except the postlateral extremity, by the thorax; the second, third, 

 fourth and fifth segments are subequal, about 1 mm. long; they are 

 decidedly curved posteriorly and overlap each other; the postlateral 

 angles are acutely produced, the sixth segment is shield-shape, wide 

 as long, 6 mm., 6 mm., its length being slightly greater than that of 

 the first five segments ; the postlateral margin is evenly rounded. 

 Uropoda 4 mm. long, biramous ; peduncle triangular, posterior mar- 

 gin bluntly toothed, with inner postlateral angle acutely produced ; the 

 outer branch slender, curved, terminating in a bluntly rounded point ; 

 the inner branch is not quite as long, more oval basally, but also 

 bluntly pointed distally. Pleopoda five pairs, natatory, biramous, outer 

 branch much the larger, oval, folding over the smaller but similar 

 inner blade. 



Synonymy. — Pterisopodus hartscJii Boone, Proc. U. S. Nat. Mus., vol. 

 54, p. 596, pi. 89, figs. 2, 3, 4 and 5, 1918. 



