BY WILLIAM A. IIASWSCLL, M.A., B.SC. 327 



Genus Iphimedia, Kathke. 



Iphimedia V ambigua, sp. nor. (PI. XXIV., fig. 2.) 



Cejmalon with, a long, pointed rostrum. First segment of the 

 pereion broad ; the second to the sixth, inclusive, very narrow, 

 the seventh and the first three segments of the pleon very wide ; 

 the seventh segment of the pereion and the first three segments 

 of the pleon each armed with an acute spine on each side near 

 the middle dorsal line, and another at the postero-lateral angle ; 

 third segment armed in addition with an acute, curved spine 

 situated between the lateral angle and the dorsal spine. Coxre 

 of the gnathopoda and the two anterior pairs of pereiopoda deep, 

 that of the second pair of pereiopoda excavated behind for that 

 of the third pair, the latter together with the two following pairs 

 with a spine-like posterior angle. Antenna? subequal, the inferior 

 pair rather longer than the superior. Anterior gnathopoda 

 slender, filiform. Posterior gnathopoda slender, sub-ch elate. 

 Basos of the third pair of pereiopods armed on the posterior 

 border with an acute spine near the proximal end ; basos of the 

 fourth pair with two short spines, that of the fifth pair with the 

 posterior border serrate and armed with an acute spine near its 

 distal extremity. Last pair of pleopoda biramous, the inner 

 ramus longer than the outer, bi-articulate. Telson scale-like, 

 entire. Colour red with brown dots. Length 3/30ths in. 



Sub-fam. GAMMABIDES. 



Genus Atyltjs, Leach. 



Atylus monoculoides, sp. nov. (PL XVIIL, fig. 4.) 



Eyes very large, nearly meeting above. Superior antenna} as 

 long as the cephalon and first six segments of the pereion ; first 

 segment of the peduncle rather shorter than the cephalon, stout ; 

 second narrower and shorter, third scarcely distinguishable from 

 the articuli of the fiagellum ; nagellum nearly twice as long as 

 the peduncle ; articuli broader than long at the proximal end, 



