REPORT ON THE AMPHTPODA. 1397 



Second Per&opods. — Side-plates rather broader than the preceding pair, of somewhat 

 pentagonal shape, bnt with all the angles rounded. The limb nearly as in the preceding 

 pair, but the first joint more regularly oval, the third joint rather longer and the fourth 

 rather shorter. 



Third Peneopods rather shorter than the two preceding pairs. Side-plates broader 

 than deep, rather deeper in front than behind. The first joint with convex front 

 margin, the hind margin of the front surface almost straight till near the rounded apex, 

 which projects behind the other margin and the following joint ; some of the muscles 

 almost reach the base of the joint ; the following joints similar to those of the second 

 peraeopods, but without spines or pectination, the fourth joint less wide, the fifth joint 

 shorter but fully as broad ; the finger similar. 



Fourth Perteopods. — The side-plates broader than the preceding pair, very much 

 broader than deep. The branchial vesicles longer and broader than the first joint. 

 The limb scarcely differing from the preceding, but the first joint rather broader and 

 more oval, the third and fourth joints subequal in length, the fifth joint a little longer 

 than in the third peragopods. 



Fifth Peraeopods like the fourth, but the side-plates less deep, the first joint rather 

 larger and more oblong, the fifth joint shorter than in the third pair. The third, fourth, 

 and fifth perseopods are as nearly as possible equal to one another, but shorter than the 

 first and second. 



Pleopods. — The cleft spine has the serrate arm much stouter than the other, which 

 is also shorter and has a very small subapical dilatation ; the first joint of the inner 

 ramus, besides being ciliated above the cleft spine, has some five or six plumose setae 

 below it ; the first joint of the outer ramus is also bordered with five or six plumose 

 setae ; each ramus has from eighteen to twenty joints. 



Uropods. — Peduncles of the first pair longer but narrower than those of the third, 

 longer than the rami, the distal margin minutely pectinate ; the rami set a little apart at 

 the base, elongate lanceolate, the adjacent edges pectinate, near the base slightly emarginate 

 and furred, the other edges smooth, the apices acute ; the outer ramus a little shorter than 

 the inner ; the peduncles of the second pair a little shorter and narrower than those of the 

 third, longer than the rami ; the outer ramus shorter and much narrower than the inner, 

 its inner margin pectinate, the inner ramus a little shorter than the rami of the first pair 

 but much broader, the outer margin and lower part of the inner margin pectinate ; this 

 ramus scarcely reaches the middle of the rami of the third pair ; peduncles of the third 

 pair much longer than the rami, very broad except near the base, the lower part of the 

 inner margin pectinate, its apex sharply squared ; the rami subequal in length, the outer 

 much the narrower, with its outer margin smooth, the inner pectinate ; the inner ramus 

 broadly lanceolate, with both edges pectinate. 



Telson longer than broad, not half the length of the peduncles of the third uropods, 



