REPORT ON THE AMrHIPODA. 1011 



large spine-teeth are on the border and a long row of stiff feathered setae ; the inner 

 plates not quite reaching the end of the second joint of the palp, armed along the inner 

 margin with large finely pectinate spine-teeth, the series continuing with increasing size 

 and curvature round the distal margin, the spines there being plumose below, and the last 

 one or two of the row becoming more or less setiform ; there are besides on the surface 

 adjoining the inner margin many slenderer, but not pointed spines ; the palp has a first 

 joint shorter than the third, the second long, the third short, oval ; the finger subequal 

 in length to the third joint ; the nail much more than one-third the total length, with 

 some setules on the inner margin near it ; the dorsal cilium near the base of the finger 

 is shorter than the naU. 



First Gnathopods. — The side-plates shallow, with an appearance, not confined to 

 this pair, as if the true first joint were enclosed between two side-plates, the inner being 

 much the smaller, the lower margin outdrawn in front to a sharp point, slightly crenate, 

 and fringed with setules. The first joint extending for almost its whole length beyond 

 the side-plate, the front margin nearly straight, with setules, the hinder with long setae 

 above, and below these three groups of spines, of which some are finely pectinate ; the 

 second joint short, much narrower than the first, with an apical group of spines behind ; 

 the third joint oblong, produced to a sharp apex, the hinder margin fringed with many 

 groups of spines ; the wrist nearly as long as the first joint, longer than the hand (the 

 difference seemingly greater in the large than the small specimens), crowded with pectinate 

 spines on the hind margin and most of the inner surface, some showing along the front 

 margin and at its apex ; the hand at the commencement of the palm broader than the 

 wrist ; with many groups of spines along the hind margin, the longest row being at the 

 commencement of the palm on the outer side ; there are several groups also on the 

 inner surface a little way from the hinder margin, and several close to the longer front 

 margin; the oblique slightly convex palm is finely denticulate and fringed with subinar- 

 ginal spine-teeth and setules ; the finger fits closely over it. 



Second Gnathopods. — Side-plates broader above than below, broader than deep, with 

 some small spines on the lower margin. Branchial vesicles tending to oval, broad distally. 

 Marsupial plates narrow. The first joint rather broad, all but the narrow neck clear of 

 the side-plate, the hinder margin fringed with long setae or setiform spines ; the second 

 and third joints much as in the first gnathopods, but the third joint with only one group 

 of spines od the hind margin in addition to the apical group ; the wrist short, triangular, 

 distally cup-like, its hind margin fringed with many pectinate spines ; the hand massive, 

 much longer than the first joint, widest distally, much wider than the wrist, with small 

 groups of spines near the front margin and along and near the hind margin, which is 

 apically produced into a tooth with a strong palmar spine on each side of it ; the palm is 

 convex, very oblique, and the sculpture of it varies not only in different specimens but 

 on the two sides of the same animal (at least this was the case in three of the specimens 



