AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 211 



angle quadrate and very slightly produced ; third, rounded anteriorly, inferior margin 

 slightly convex, posterior more strongly convex, posterior angle quadrate (fig. 20). 



Eyes large, prominent, oval, less darkly pigmented in the larger specimen. Upper 

 antennae more than half the length of the body, first segment stout, with sharp tooth 

 below and smaller lateral teeth at its extremity ; second as long as the first, but much 

 more slender, ending in numerous sharp teeth which are almost as long as the third 

 joint ; third joint very short, also ending in sharp teeth ; flagellum much longer than 

 the peduncle, many-jointed, each second joint produced below and bearing calceoli in 

 addition to other setae, proximal joints very short ; accessory flagellum slender. 



Gnathopoda similar to those of E. antarcticus, but with the propod broader ; second 

 gnathopod slightly larger than the first ; first and second perseopoda very slender, 

 longer than the gnathopoda ; third, fourth, and fifth pairs increasing in length, the 

 fifth being about as long as the perseon and pleon combined. First uropod with outer 

 branch about two-thirds the length of the inner, which is as long as the peduncle ; 

 second with outer branch half the length of the inner and as long as the peduncle ; 

 third with peduncle short, branches subequal and slender ; telson more than twice as 

 long as the peduncle of third uropod, very narrow, with two slight lateral ridges on the 

 upper surface and a shallow central groove between them ; cleft not more than one- 

 sixth the length, the two posterior lobes very acute and widely divergent. 



Length of body : up to 35 mm. 



It is only with great reluctance that I establish this new species, but the compres- 

 sion of the hinder part of the body and its production into carinal teeth is carried to 

 a much greater degree than in any of the species of Eusirus known to me. In all the 

 specimens of E. antarcticus only the pleon segments are produced into teeth, with 

 occasionally a small tooth on the last segment of the perseon ; and until transitional 

 forms are known it will, I think, be safer to rank the present specimens as a separate 

 species. There are also some differences in the uropoda, but whether these are merely 

 associated with age or not I cannot say. 



The general resemblance to E. antarcticus in the appendages is, however, so great 

 that I should not be surprised if it proves ultimately to be a special form of that 

 species. WALKER has, however, had larger specimens before him which apparently 

 showed only the normal amount of carination. 



Genus EORYMERA Pfeffer, 1888. 



Eurymera monticulosa Pfetfer. 



Eurymera monticulosa Pfeffer, 1888, p. 103, pi. i. fig. 3. 

 Stebbing, 1906, p. 357. 



Clievreux, 1906B, p. 59, figs. 34-36. 



South Orkneys, Scotia Bay, Station 325 ; dredge, 4 fathoms, gravel bottom, 

 clumps of weed. 3rd December 1903. Temperature 29'l. One specimen, 

 imperfect, 1 5 mm. 



(llOY. SOC. BDIN. TRANS., VOL. XLV1II., 493.) 



