NEW BEITISH AMPHIPODA. 37 



trunk, set far forward, the first joint rather longer than broad, the second about three 

 times as long as broad, with several setse along the front, and one or two on the hind 

 margin; the rather shorter third joint has four or five setse or spines near the hind 

 margin, and several on the truncate apex and distal part of the front margin. 



First maocillm. The long second joint of the palp has four spine-teeth on the 

 truncate apex. 



Maxillirpeds. Inner plates not reaching the middle of the outer, and these not 

 reaching the middle of the second joint of the palp, the spine-teeth on the inner 

 margin passing into curved spines on the apical border, the series about nine in 

 number; the long second joint of the palp fringed, but not closely, with setse; the 

 third joint scarcely so long as the first, the fourth much shorter ; the blunt apex tipped 

 with spines. 



First gnathopods. Side-plates distally widened. First joint slightly curved, reaching 

 beyond the side-plates, the third joint almost oblong, with spines on the convex front 

 and along the apical margin ; the wrist fully as long as the hand, not very much shorter 

 than the first joint, with slender spines on the surface, round the distal border, and in 

 two groups on the hind margin ; the convex front border of the hand carrying four 

 groups of very slender spines, of which the much shorter hind margin has two groups, 

 the deeply excavate palm being bordered with spinules and a group of spines ; the 

 finger slender, curved, reaching beyond the extremity of the palm and its palmar 

 spine, and having some minute setules and microscopic furring along its inner margin, 

 which has also a very small tooth far from the apex. 



Second gnathopods. The side-plates larger and of more uniform width than the first 

 pair. The first joint reaching beyond the side-plates, not longer and very much 

 narrower than the hand, the third joint rather longer than in the first pair, but with 

 fewer spines ; the wrist triangular, cup-shaped, about half the length of the hand, 

 which is much wider, broadly oblong, with several groups of slender spines along 

 the hind margin, and one or two on the smoothly convex palm, which is left partly 

 exposed by the slender curved finger, as this bends almost abruptly from the hinge on 

 to the inner surface of the hand, its acute tip reaching beyond the middle of that 

 surface, the concave margin having setules at three or four points. The general 

 resemblance of this limb to the corresponding one in Melita palmata (Montagu) may 

 be noted. 



First perceopods. Side-plates rather larger than the preceding pair. Branchial 

 vesicles small. The first joint reaching below the side-plate, both margins convex, 

 the hinder carrying two or three very slender spines; the third joint about once and 

 a half as long as broad, slightly armed at two points of each margin ; the fourth joint 

 narrower and shorter than the third, with very convex front margin ; the fifth joint 

 subequal in length to the third, with spinules at three points of the straight hind 

 margin; the finger curved, not much shorter than the fifth joint. 



