26 A. 0. WALKER. 



The telson narrows distally, the sides are slightly convex, and the divisions formed 

 by a notch extending to about one-third of the length are subacute. 



Length 33 mm. 



This species has a superficial resemblance to Acanthozone (Boeck.*), from which it 

 differs in the shape of the head, and Acanthechinus (Stebbing), from which it differs in 

 the head, mandibles, gnathopods, etc. Both these genera have the telson entire. 



EPIMERIELLA. 

 Epimeriella, A. 0. Walker, Ann. and Mag. Nat. Hist. XVIII. (1906), p. 17. 



Body smooth, without dorsal teeth, except in the first segment of the urus. 



Head with a very small rostrum. 



Fifth pair of side plates small, oblong, wider than deep, without a projecting process. 



Mandibles with the molar tubercle imperfectly developed. 



Third and fourth pairs of perseopods much longer than the fifth. 



Otherwise like Epimeria. 



EPIMERIELLA MACRONYX.! (PL 9, fig. 15.) 

 Epimeriella macronyx, A. 0. Walker, Ann. and Mag. Nat. Hist. XVIII. (1906), p. 17. 



W.Q., 29 May, 1903, Hole 4, 5 fm., two; W.Q., 1 June, 1903 ; Hole 8, 10 fm., 

 three; 26 Feb., 1904 (269), one. This last measured 25 mm. ; the rest were young, 

 measuring only 6 mm. 



Head slightly produced in front. Eyes large, round, oval, prominent, colourless 

 in spirit. 



Mesosome smooth, first and third segments subequal, and much longer than the 

 second ; remaining segments increasing in length successively. First three side-plates 

 about as deep as the segments, narrow, convex, and pointed below, fourth deeper than 

 the others, narrowing below in a curved point, with the upper posterior angle produced 

 under the fifth side-plate in an acute tooth ; fifth, small, transverse, oblong, with 

 rounded ends. 



Pleon with an obscure dorsal carina ; hind and lower margins of the third 

 segment straight and forming a right angle. 



First segment of the urns dorsally depressed in front, and with a postero-dorsal 

 tooth. 



Upper antennae : First joint more than twice as long as, and much wider than, the 

 second ; third shorter than the second and subequal to the first joint of the flagellum, 

 which has about twenty joints. 



Lower antennae subequal to the upper ; first joint very short ; second and third 

 subequal, barely reaching to the end of the second joint of the upper. 



Mandibles : Molar tubercle imperfectly developed ; primary and secondary cutting 



* Skandinavske og Arktiske Amphipoder, 1876, p. 229 ; also G. O. Sars. 

 t From the great length of the dactyli of the third and fourth perseopods. 



