REPORT ON THE AMPHIPODA. 1581 



long or so broad as the first joint. The first joint tending to circular, a little shorter 

 than the first joint of the preceding pair, but broader, similarly armed, the distal end 

 the narrowest part, with a sinuous margin ; the remaining joints similar in general shape 

 to those of the preceding pair but shorter, the fourth and fifth much shorter, the third 

 joint longer than the fifth ; the front margin of the third, fourth, and fifth joints pectinate, 

 the larger teeth interspaced with minute teeth, of which there are some also on the 

 distal margins and a few on the inner margin of the almost straight finger near the base. 



Fifth Perwopods. — The side-plates produced below and in front into a small lobe, the 

 lower margin to the rear of the lobe nearly straight, forming a right angle with the 

 slightly convex hind margin, above which the plate is separated from its segment by an 

 incision extending for about one-third of the total breadth. The first joint papyraceous, 

 pear-shaped, as long as the first joint of the fourth peraeopods, and near the base two- 

 thirds as wide, distally greatly narrowed; the remaining joints linear, together not quite 

 so long as the first, the whole limb much more than half the length of any preceding 

 pair ; the second joint short, with a spinule on the convex front margin ; the third as long 

 as the three following united, narrowing a little distally, the front margin nearly straight, 

 with some minute spinules, a long oval packet of gland-cells filling most of the joint ; the 

 fourth joint much narrower than the third, rather longer than the fifth ; the fifth much 

 narrower than the fourth, tapering to a very small sharp nail, which looks like the sharp 

 point of a pencil cut with a narrow stalk. 



Pleopods small in proportion to the size of the animal ; the peduncles large in 

 proportion to the rami, filled with strong muscles, the general appearance oval, but the 

 front margin flattened, the hind margin double, strongly convex, the rim of the outer 

 surface projecting a little beyond that of the inner ; the coupling spines two in number, 

 very short, the apex forming a circular cap of retroverted hooks ; on one of the peduncles 

 there were three coupling spines, but this might be abnormal ; the cleft spine having a 

 broad subapical dilatation of the longer arm ; the joints of the rami numbering from 

 eleven to thirteen or fourteen, the inner ramus slightly the longer but with fewer joints. 



Uropods. — Peduncles of the first pair considerably longer than the rami, both the 

 upper edges pectinate, the outer margin at the base folded on to the upper surface ; 

 below there is a central longitudinal ridge or carina, with another on either side of it ; 

 the inner ramus is longer than the outer, with a narrower neck, and reaches back a 

 little beyond the third uropods ; both rami are acutely lanceolate, with pectinate edges, 

 and carinate below ; the outer edge of the outer, and the inner of the inner, nearly 

 straight ; the peduncles of the second pair widen till they reach the base of the rami, not 

 extending quite to the base of the telson, on the inner side terminating in a small sharp 

 point ; the outer ramus is the shorter and much the narrower ; the inner, which does not 

 reach so far as the apices of either of the other pairs, is firmly coalesced with the peduncle, 

 broadly lanceolate, acute, and like its fellows pectinate and ridged ; the third uropods 



