REPOET ON THE AMPHIPODA. 715 



second, followed by a small but very distinct finger, straight, tapering, ending in a sharp 

 nail with cilia on either side. At the apices of the third and fourth joints of the palp 

 are two or three setse ; on most of these the parasitic growth already alluded to is 

 conspicuously displayed, the seta throughout its length being plumose with long, flexible 

 cylinders, tapering distally, and presenting a minutely beaded appearance. 



Fh'St Gnathopods. — Side-plates broad, rounded at the lower front angle, the cilium- 

 carrying incision of the hinder angle raised a little above the lower margin. The first 

 joint of the limb attached high up and only just reaching below the side-plate; the 

 second joint as long as the wrist, the third very short ; the wrist broader but much 

 shorter than the hand ; the hand tapering, with no palm ; the finger curved, about half 

 the length of the hand, with a spine on its inner partially pectinate margin near the 

 nail. The second and thiixl joints each have along apical seta behind, the wrist has two, 

 the hand has a row of three not so long, and two on the front apex, besides a cilium in 

 the middle of the convex front margin. Many of the set« have the anguilliform 

 appendages. 



Second GnatJwpods. — Side-plates much narrower and not much deeper than those of 

 the preceding segment ; first joint not reaching to the end of the side-plate ; second joint 

 as long as the wrist ; third shorter than the wrist, lightly furred on the veiy convex hind 

 margin ; wrist shorter than the hand, slightly furred on both' margins ; hand long, widest 

 towards the distal end, furred on both sides, the marginal cilia having something of a 

 scale-like appearance ; the finger minute, as it were an equilateral triangle with a little 

 hooked nail at the apex, this organ forming a tiny chela with the produced hind margin 

 of the hand. There are no long spines or setse upon these gnathopods, here and there a 

 seta is found that might be called a cUium, except for the sake of distinguishing it from 

 the neighbouring cilia with which some of the joints are furred ; on the front apex of the 

 hand the most important group consists of three or four straight and seemingly simple 

 spines or setaa. 



First Perseojiods. — Side-plates similar to those of the preceding segment, but somewhat 

 larger. The first joint not reaching to the end of the side-plate. 



Second Perieopods similar to the first. Side-plates not very broad, the excavation 

 behind slight, descending far down, the hind margin being then directed forwards, and 

 being incised for a cilium just before meeting the lower margin ; one of the minute cilia 

 within the lower margin carries anguilliform ajspendages. The first joint rather broad, 

 not long, not nearly reaching the lower end of the side-plate ; the second joint longer 

 than the fourth ; the third broad, not decurrent, as long as the fifth, with one or two 

 setse on each mai'gin ; the fourth with one apical seta behind, and some microscopical 

 scales on the breast ; the fifth with its straight hind margin pectinate or squamose like 

 the preceding joint, the convex front margin smooth, except for a seta at the apex, 

 which on the other margin carries a spine ; the finger stout, curved, with a strong nail. 



