ATT ST KALIAN MALACOSTEACA. 245 



subequal the posterior pair slightly smaller than the anterior ; 

 propodos ovate, armed with a few plumose seta?, palm oblique, 

 undefined. Last pair of pleopods with the rami armed along 

 their edges with numerous serrations, each with a short seta in 

 the axil of which is inserted a delicate hair. Length about ^ in. 

 Port Jackson. 



435. Atylus austrinus. 



Atylus austrinus, Spence Bate, Cat. Ainphip., p. 137, pi. xxvi., 

 fig. 4. 



Dorsal surface not denticulated. Eyes oval. Superior antenna? 

 half as long as the animal ; peduncle one-third of the length of 

 the flagellum ; articuli of the flagellum broader than long, each 

 carrying distally, above and below, short seta?. Inferior antennae 

 a little more than half as long as the superior; peduncle as long 

 as the peduncle of the superior. Gnathopoda slender ; propoda 

 scarcely broader than carpi. First pair having the propodos 

 ovate ; palm not oblique, convex, fringed with short fine cilia, 

 with two rows of short sharp spiues, one near the inferior angle, 

 the second a little posterior. Second pair having the propodos 

 long-ovate ; palm oblique ; inferior angle defined imperfectly by 

 a lateral row of short spines. Three posterior pairs of pereio-" 

 poda having the dactylos in each directed anteriorly. Posterior 

 pair of pleopoda naked, and considerably longer than the two 

 preceding pairs. Telson long, cleft for about two-thirds of its 

 length. [<& 2?.] 



Sydney (Antarctic Expedition). 



Genus Piiekusa, Leach. 

 Differs from Atylus in having the telson entire, not cleft. 



436. Pherusa lsevis. 



Plierusa Icevis, Haswell, 1. c, p. 260, pi. ix., fig. 4. 



Eyes round. Superior antenna? equal in length to the cephalon 

 and first six segments of the pereion ; first two segments of the 

 peduncle subequal ; third scarcely half the length of the second ; 

 flagellum much longer than the peduncle. Inferior antenna? 

 longer than the superior pair ; fourth segment of the peduncle 

 the longest ; flagellum nearly twice as long as the peduncle. 

 Anterior gnathopoda with the carpus and propodos subequal, 



