KEPORT ON THE AMPHIPODA. 693 



notched iu the same way, outer niargm convex, hinder nearly straight. Branchial 

 vesicle with a fold near the base. First joint a little curved, slightly dilated distally, with 

 one 01 two fine setse on the antero-distal part of the margin ; second joint much longer 

 than third, with the lower half of hinder part furred, and one terminal seta ; third joint 

 short, shaped like a pipe-bowl, furred behind, carrying one or two setae ; wrist equal in 

 length to second joint, considerably longer than the hand, thickly furred nearly all over ; 

 hand longer than broad, densely furred, hinder margin running out into a small thumb 

 beset with short spines ; close to the thumb is set the short finger, thick at the base, the 

 much-curved nail over-arching the thumb. Between the front margin of the hand and 

 the finger is a bunch of straight spines, greatly varying in length, with curved tips. 



First Perwopods. — Side-plates like those of the second segment. Two setse on hind 

 border of second joint ; third joint longer and much wider than the fourth joint or the 

 fifth, with one seta on the outdrawn antero-distal angle, and four on the hind margin ; 

 fourth joint wider but shorter than fifth, with four setse on the hind margin ; fifth joint 

 narrow, with four short setse on the hind margin and a spine at the junction with the 

 finger, a cilium in front not one-third of the margin's length from the end, a bunch of 

 cilia at the end ; finger curved, with the usual cilium near the beginning of the front 

 margin. 



Second Pera^opods. — Side-plates broad, excavated behind. The leg not materially 

 difi"ering from the preceding. 



Third Peraeopods. — Side-plates broad, front margin very convex, front lobe descending 

 decidedly below the hinder one ; first joint very large, very convex in front, widest 

 above ; front margin carrying two spines in the upper part, in the lower serrate part 

 spines and setse alternating ; hinder margin notched, with cilia in the notches ; the short 

 second joint is overlapped by the hinder lobe of the first joint ; the third joint is shorter 

 than the fifth, distended in the middle, having three setse on the front margin, and two 

 spines on the hinder one ; fourth joint shorter than third, with one or two spines and 

 setse ; fifth joint slender, with three pairs of spines on the front border, the hinder margin 

 and finger as in the first perseopods. 



Fourth Peraiopods. — First joint much longer and a little wider than that of the third 

 perseopods ; its third joint on a larger scale, longer than the fifth joint, the armature of 

 the joints in general similar to that of the preceding and following pairs of legs. 



Fifth Per3B0])ods. — First joint a very irregular oval, much longer and considerably 

 wider than the first joint of the fourth perseopods, the third joint less developed than in 

 that limb ; on the hinder margin of the third joint a row of three spines, on the outdrawn 

 apex two and a seta. 



Pleopods. — Eight to ten articulations compose the rami ; there are ten plumose setse 

 on the dilated l^asal joint of the outer ramus. 



Uropods. — Peduncle of first pair rather longer than the rami, outer ramus rather 



