PEPORT ON THE AMPHIPODA. 1127 



longer spines at its apex ; the bind margin microscopically pectinate or furred, fringed 

 with slender spines in six or seven small groups ; there are three groups also on the 

 inner surface at a distance from the hind margin ; the hand between oval and oblong, 

 nearly as long as the wrist, with four groups of spines at the slightly convex front 

 margin, five or six along the almost straight hind margin, which makes an obtuse angle 

 at the oblique slightly convex palm ; the palm is defined by a palmar spine, and 

 bordered with slender spines of various lengths, its edge like that of the hind margin 

 being microscopically furred or pectinate ; there are setiform spines at six points of the 

 inner surface, distant from the hind margin ; the finger is broad and strong, the outer 

 margin much curved, with a small dorsal cilium near the base, the inner margin fitting 

 the palm, cut into sinuous decurrent teeth, and ending in a very sharp nail, which 

 projects beyond the palm. 



Second Gnathopods. — The side-plates a little broader below than above, deeper 

 than the preceding pair, and much wider above, but scarcely so wide below. The 

 marsupial plates long and rather narrow, longer and a little wider than the first joint ; 

 distally tapering to a point, closely set all round with a vast number of very long setae. 

 The first joint reaching beyond the side-plate, rather larger and stouter than the first 

 joint in the preceding pair, and less constricted at the base, with several groups of long- 

 spines on the hind margin, the front produced below in a rounded lobe ; the second and 

 third joints nearly as in the preceding pair, but rather broader, and the third with more 

 spines, and the distal margin less contracted ; the wrist shorter than the hand, but 

 distally wider, the distal width being almost equal to the length ; the convex hind 

 margin smooth, but the distal margin, where it projects beyond the hind margin of the 

 hand, carrying an immense brush of long slender spines ; the hand almost oblong, very 

 similar to that of the first gnathopods, but wider, the width scarcely varying from near 

 the base to the origin of the palm ; the armature of the hand and the finger are 

 simdar to those in the preceding pair. 



First Perwopods. — The side-plates larger than the preceding pair, tending to oblong, 

 but broader above than below, and with the corners rounded, especially the lower front 

 one. The branchial vesicles large and inflated, rather longer than the first joint. The 

 marsupial plates similar to the preceding pair, longer than the branchial vesicles. The first 

 joint reaching beyond the side-plate, containing rows of dark gland-cells, of nearly uniform 

 breadth except at the base, much wider as well as much longer than any of the following 

 joints, with many groups of long spines along the hind margin, the front margin fringed 

 with spines and setae ; the second joint scarcely longer than broad, with spines at the apex 

 behind ; the third joint widening distally, broader but scarcely longer than the fourth joint, 

 with spines or spinules at four points of the straight pectinately furred hind margin, 

 spinules at two points in front and long slender spines at the apex ; the fourth joint 

 narrowing a little distally, with slender spines at five points of the straight scabrous 



