REPORT ON THE AMPHIPODA. 1143 



for half its length projects beyond the palm ; the dorsal cilium is rather long, close to the 

 base. In the female the shape of the gnathopods is the same, the spines are fewer ; the 

 side-plates are directed a little forwards, narrow, the lower margin very convex, separated 

 from the hinder by a little notch. 



Second Gfnathopods. — Side-plates rather larger than the preceding pair, the breadth 

 and depth about equal, the margins convex. The branchial vesicles very small, oval, the 

 two following pairs larger, the fourth and fifth pairs again smaller. The first joint much 

 shorter than the hand, bent forwards, narrow at the base, distally, beyond the side-plate, 

 expanded in front into a rounded lobe carrying a couple of spinules ; the second joint is 

 very short, broader than long ; the third not much longer than broad, with spines on the 

 distal margin ; the wrist very short, broader than long, distally cup-like, with a few 

 spines on the apex behind ; the hand broad and long, not twice as long as broad, with 

 some spinules at the apex of the slightly convex front margin, and a couple of setules 

 higher up ; the much shorter hind margin has three groups of slender spines upon it 

 and other spines on the adjacent surface, and apically forms a tooth -process, nearly an 

 equilateral triangle, from which the long concave palm runs almost parallel to the front 

 margin towards the finger, bordered with many submarginal slender spines, and before 

 reaching the hinge bends abruptly, then conforming to the inner margin of the finger ; 

 the finger is stout, much curved, the inner margin smooth, the short nail reaching the 

 triangular process already mentioned, of which the inner margin is crenulate ; the part of 

 the palm-margin near the finger appears to be finely serrate ; the dorsal cilium of the 

 finger is very short. In the female the first joint is less expanded distally, the hind 

 margin of the hand is relatively longer, the palm rather shorter, the triangular process at 

 the junction less conspicuous and accompanied by two submarginal palmar spines which 

 were not observed in the other form ; the finger is broad, curved, with the inner margin 

 finely pectinate, carrying two little spine-teeth, and ending in a larger tooth, accompanied 

 by three setules, at the base of the long curved smooth-edged nail, which reaches beyond 

 the triangular process, of which the outer margin is pectinate. The dorsal cdium is long. 



First Perseopods. — Side-plates rather deeper than broad. The first joint packed with 

 three rows of gland-cells, reaching a little beyond the side-plate, not twice as long as 

 broad, the front margin more convex than the hinder, with a spinule below the centre, 

 the hind margin carrying three or four spinules, the distal margin projecting beyond the 

 next joint ; the second joint a little longer than broad, with an apical spinule ; the third 

 joint much longer than the fourth, and a little longer than the fifth, with a group of 

 spines on the decurrent front apex, and a small spine higher up, the much shorter hind 

 margin similarly armed ; the fourth joint very little longer than broad, with two single 

 spines on the hind margin, and an apical group ; the fifth joint with two spinules on the 

 convex front margin, and a group of slender spines at its apex, the hind margin almost 

 straight, with two single stiff spines, followed by three small groups of slender spines ; 



