AMPHIPODA. 25 



First two segments of the urus with an upright dorsal tooth, that on the first segment 

 the longer ; the third segment with a lateral carina, which is turned up in a sharp 

 tooth. First three side plates narrow, acutely pointed below, the first straight, second 

 and third curved ; the hind margin of the fourth forms an irregular crescent with 

 acute points ; the fifth has a long acute tooth directed backwards and outwards, 

 reaching the hind margin of the sixth segment ; the sixth has a small tooth ; the 

 seventh unarmed. Posterior angles of the epimeres of the pleon segments produced 

 and acute. 



Head: Lower margin of the ocular lobe produced forward in an acute tooth. 

 Rostrum almost horizontal, slightly decurved, and much longer than the rest of the 

 head. Eye large, round-oval, almost filling up the ocular lobe, colourless in spirit. 



Upper antennae shorter than the lower ; first joint with a subequal distal tooth on 

 each side, reaching nearly to the distal end of the lower margin of the second joint, 

 which is subequal to the first, and has two long subequal distal teeth on the upper side, 

 reaching to the seventh joint of the flagellum ; third joint about half as long as the 

 second, with a small distal tooth on the lower margin. Flagellum 32-jointed, slender. 



Lower antennse : Basal joint with four or five unequal teeth ; first joint very 

 short ; second and third more than twice as long, subequal, the former with a small 

 distal tooth below. Flagellum slender, reaching in the largest specimen to the fifth 

 segment. 



Mouth organs and maxillipeds as in E. cornigera. 



First and second gnathopods almost alike, more slender than in E. cornigera, and 

 almost exactly like those of E. parasitica, M. Sars. 



First and second perceopods : First joint subequal to but wider than the third ; 

 fourth joint about half as long as the third ; fifth considerably longer than the 



fourth. 



Third perceopods : First joint rather longer than and twice as wide as the third, 

 the hind margin concave, with a rounded protuberance at the proximal end and a 

 laro-e, very sharp tooth at the distal end directed backwards ; front margin concave in 

 the middle ; front margin of the second joint produced downwards in a small tooth ; 

 third joint acutely produced behind. 



Fourth perseopods : Hind margin of the first joint convex in the middle, otherwise 



like the third pair. 



Fifth perseopods : First joint wider than that of the fourth pair, the margins more 

 convex above, but the hind one concave above the strong and sharp distal tooth ; front 

 margins of filrst and second joints not produced. 



The uropods are all subequal in extent ; the second pair has the outer ramus one- 

 third shorter than the inner ; in the first and third pair the outer rami are scarcely the 

 shorter ; the peduncles of the third pair have the upper margins produced behind in an 

 acute tooth, and are about one-third of the length of the rami ; these are long and 

 narrow, lanceolate, with a few small spines on both margins. 



H 2 



