REPORT ON THE AMPHIPODA. 633 



than either ; the finger witii its sharp curved nail is as long as the third joint ; it has 

 some cilia near the nail, and a dorsal cilium much nearer the nail than the base. 



First Gnathopods. — Side-plates small, long-oval, narrowest at the lower end. First 

 joint strong, projecting much beyond the side-plate ; third joint very short in front, much 

 longer behind ; the wrist not so long as the hand, and scarcely broader, widened beyond 

 the triangular portion which adjoins the third joint, and furred on the hind margin of the 

 widened part ; the hand long, nearly parallel-sided, with a slight curve, hinder border 

 scarcely furred, some setse on both margins and on the side ; palm sloping, a little 

 convex, defined by two spines with stout accessory threads ; between these spines the 

 finger closes down neatly fitting the palm, and having a tooth on the inside just before 

 the nail is reached. 



Second Gnathopods. — Side-plates deeper than those of the preceding segment, much 

 wider below than above; first joint long, widening a little and curving backwards as it 

 approaches the long second joint ; third joint shorter than second, furred about the middle 

 of the hinder margin, which carries near the apex long slender spines or setse of 

 geniculate appearance ; the wrist but little longer than the second joint, furred both 

 before and behind, and with long slender spines near the apex on both sides ; the hand 

 much shorter than the wrist, oval, densely furred, with the usual armature of spines ; the 

 finger very small, set pretty well clear of the anterior group of spines, lying close to the 

 produced hinder portion of the hand which provides the palm. 



First and Second Perwopods. — Side-plates of the first similar to the preceding pair, 

 but larger, side-plates of the second much wider below than above ; first joint just 

 reaching the lower rim of the side-plate ; third joint nearly parallel-sided, scarcely produced 

 downwards, considerably longer than the fourth joint, both fringed posteriorly with setse, 

 which increase successively in length towards the distal end of the margin ; the fifth joint 

 as long as the third, but much thinner, gently curved, posteriorly armed with spines and 

 setse, and carrying close to the hinge joint of the finger a pair of spines shorter than 

 those above, blunter, and seemingly with fine backward serratures. Finger about half 

 the length of the hand in the first perseopod. In the second perseopod the third joint 

 and the hand are rather shorter than in the fii-st. 



Third Perwopods. — Side-plates rather broader than deep. First joint as broad as 

 side-plate, length and breadth about equal, narrowed below, the distal curve behind 

 produced nearly to the end of the second joint, convex front border set with spines and 

 setse ; third joint dilated, not longer than the fourth, except for the produced infero- 

 posterior angle ; fourth joint more dilated above than below ; fifth joint longer than 

 fourth, much narrower, a little curved, with five pairs of spines on the anterior margin ; 

 finger rather long and slender. 



Fourth Peraeopods. — First joint a long oval, most of the front border spined ; the 

 third joint shorter than either of the next ; fourth a little wider but shorter than the 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) Xxx 80 



