new Species of Antarctic Amphipoda. 17 



convex ill the miiltlle, the fir-st joint of the fifth the widest ; 

 otherwise like tlie third pair. 



The third iiropods have the U|)per margins of the peduneles 

 produced behind in an acute tooth ; the outer rami are slightly 

 shorter than the inner, which are about three times as lo.ig as 

 the peduncle, narrowly lanceolate, with a icw small sj>iues on 

 both margins. 



Tclson deeply notched, the ends of the divisions subacute. 



Length 33 mm. 



This species has a superficial resemblance to Acanthozonej 

 P»occk, and Acanthechinus, Stebbing, from both of which it 

 differs in the shape of the tclsou and other structural points. 



Epimkriella, gen. nov. 



Body without dorsal teeth on the mesosorae. 

 Head with a very small rostrum. 



Fifth i)air of side-plates small, wider than deep, without a 

 projecting] process. 



Mandibles with the molar tubercle imperfectly developed. 

 'Jliird and fourth perajopods longer than the fifth. 

 Otherwise like Epimeria. 



Epimeriella macronyx'^, sp. n. 



W.Q., May and June 1903; five young. 26/2/04; one, 

 length 25 mm. 



Body : mesosome smooth ; first and third segments sub- 

 equal and much longer tlian the second, remaining segments 

 increasing in length successively. First four side-plates as 

 in Epimeria ; fifth small, transverse, with rounded ends. 

 Pleon with an obscure dorsal carina ; hind and lower margins 

 of the third segment straight and forming a right angle. 

 Urus with the first segment depressed in front and provided 

 with a postero-dorsal tootli. 



Head slightly produced in front. Eyes large, prominent, 

 round-oval, colourless. AntenncB subequal, unarmed. Man- 

 dibles-with cutting-edges dentate, spine-row of about 20 spines ; 

 palp rather longer than the mandible, first joint short, second 

 and third subequal. 



Eirst gnaihopods : wrist subequal to and rather wider than 

 the hand, which is subovate ; the palm undefined and pecti- 

 nate, the whole hind margin sparsely and unequally spinous. 



Second ynathopods like the first, except the palm, which is 

 more transverse. 



* From the long dact} li of the third and fourth perteopods. 

 Ann. cfc Mag, N. Hist. Ser. 7. Vol. xviii. 2 



