52 MR. A. O. WALKER ON AMPHIPODA 



HoPLONTx Stebbingi, n. sp. (PI. 9. figs. 52-57*.) 



Cape Adare, Nov. 4 & 5, 1899 ; 26 fath. Several specimens. 



Body moderately compressed. Third segment of the metasome 

 with the posterior angle recurved, hut less so than in S. Kergue- 

 leni. Pirst segment o£ the nrosome neither dorsally depressed 

 nor carinate. 



Head rather shorter than the 1st segment. Lateral angle 

 produced to the end of the 1st joint of the upper antenncs, the 

 point rounded. Eyes not seen. 



Mouth-organs normal. 



Upper antennae : first joint almost as broad as long ; next 

 two very short. Flagellum 15-jointed, the 1st rather longer 

 than the next three, the 2nd very short. Accessory appendage 

 6-jointed, the 1st as long as the next two, the 6th minute. 



Lower antennge : second joint of peduncle almost as long as 

 the 1st and 3rd together. Flagellum 17-jointed. 



First gna.thopods : first joint about as long as the next three ; 

 carpus as long and, in its distal portion, as wide as the propodos ; 

 sides of the latter parallel. Dactylus deeply divided. Side- 

 plates narrowed and rounded below. 



Second gnathopods of the usual form, with dense tufts of setae 

 on the 3rd, 4th, and 5th joints. Length of propodos to width as 

 5:3. 



First perseopods : 1st and 3rd joints about equally long, 

 with subparallel margins ; 3rd and 4th with a few fascicles of 

 setae, and the 5th with about six spines on the hind margin. 



The last three pairs of peraeopods have the 1st joint almost as 

 long as the remaining joints, the hind margin expanded and 

 slightly serrate. The 3rd pair is rather shorter, and has the 3rd 

 joint more expanded than the 4th and 5th pair. 



First and second uropods have the peduncles rather longer 

 than the subequal rami and are sparsely spinous. The peduncle 

 of the 3rd uropods is shorter than the rami, of which the outer is 

 slightly the longer ; both rami are sparsely setose on the inner 

 margin. 



Telson long and narrow, cleft almost to the base. 



Length 18 mm. 



Differs from H. Kergueleni in the absence of a depression on 

 the 1st urosome-segment, the less upturned angle of the 3rd 

 metasome-segment, the blunt lateral angle of the head, the nar- 

 rowed side-plates of the 1st gnathopods, &c. 



