Amphipoda Synopidea. 11 



there are 3 — 4 long, simple hairs, longer than the dactylus. The dactylas 

 is strong, feebly curved, only a little shorter than the metacarpus. 



The second 2)air. The femur is long, narrow, smooth; the genu is 

 very short, the tibia more than twice longer, smooth. The carjnis is 

 longer than the femur, more than five times longer than broad, the an- 

 terior margin straight, the posterior feebly curved and provided with very 

 strong, plumose bi'istles; at the upper third of the joint these bristles are 

 geniculate, six in number; at the lower part they are straight, very 

 long, 8 — 10 in number. The metacarpus is longer than half the carpus, 

 a little dilated, four times longer than broad. The anterior margin is 

 nearly straight, the posterior irregularly curved, fringed with 10 — 12 

 strong, plumose bristles, longer than the breadth of the joint. At the 

 lower end there are two long, simple hairs on each side of the dactylus, 

 as long as the metacarpus itself. The dactylus is very small, shorter 

 than a sixth of the length of the preceding joint, pedunculated; the 

 peduncular part is a little longer than the claw. 



The third pair [PI. I, fig. 13]. The femur is as long as the epi- 

 meral is deep, broader at the posterior margin; the genu is short, the 

 tibia very long and broad, laminar, with the hinder margin strongly 

 curved, the anterior straight, smooth, with a single simple hair at each 

 of the lower corners. The carpus is broad, ovate, laminar, the hinder 

 margin fringed with 10 — 11 unequal, plumose hairs; it is longer than 

 the tibia (16: 13). The tibia and carpus together equal the length 

 of the femur. The metacarpus is narrow, nearly linear, shorter than 

 the carpus (13: 17), the posterior margin with three simple hairs. 

 The dactylus is a little longer than half the metacarpus, pedunculated; 

 the peduncular part is elongate, lanceolate, more than twice as long as 

 the claw, which is feebly curved, sharp. 



The fourth pair [PI. I, fig. 14]. The femur is elongate-elliptical, very 

 narrow at the upper end, with a long, simple hair at the lower posterior 

 corner. The gemi is short, with a plumose hair at the posterior margin. 

 The tibia yqyj broad, laminar, triangular with rounded corners, broader 

 than long (14: 9), with a plumose hair at the hinder margin and a long 

 simple one at the anterior corner. The carpus is long and very broad, 

 laminar, the anterior margin is straight, the under margin nearly straight, the 

 hinder margin curved, and the upper margin excavated. It is scarcely a 

 third longer than broad. Along the lower and hinder margins there is a row 

 of 15 plumose hairs, the longest shorter than the breadth of the joint. 

 The metacarpus is elongate-ovate, longer than half the carpus, with four 



