ATJSTKALIAN MALACOSTBACA. 247 



along the inferior margin of the propodos. Pereiopoda slender, 

 subequal. Posterior pair of pleopoda biramous. Telson long, 

 narrow, cleft at the apex. [$.i?.] 



438. Eusirus dubius. 



Eusvrus dubius, Haswell, 1. c, Vol. iv., p. 331, pi. xx., fig. 3. 



Last segment of the pereion with a median posterior spine. 

 First two segments of the pleon each with five spines ; fourth 

 and fifth segments strongly keeled, the keel ending behind in an 

 acute tooth. Eyes round. Superior antennae equalling in length 

 the cephalon and first three segments of the pereion ; first 

 segment of the peduncle compressed from above downwards, 

 nearly as long as the cephalon ; second much shorter ; third 

 scarcely distinguishable from the articuli of the fiagellum. 

 Plagellum longer than the peduncle, with a well-developed 

 secondary appendage. Inferior antennas half as long as the 

 body ; the peduncle longer than the superior pair ; third segment 

 very short ; the others long, the fifth rather longer than the 

 fourth ; fiagellum slightly longer than the last segment of the 

 peduncle. Maxillipedes with a strong pointed dactylos, devoid 

 of squamiform plates. Anterior gnathopoda with the carpus 

 closely applied to the propodos, having a palmar process armed 

 with a bunch of hairs ; propodos ovate, longer than the cephalon. 

 Posterior gnathopoda larger than the anterior pair, the carpus 

 and propodos of a similar form; the latter longer than the 

 cephalon and first segment of the pereion. Pereiopoda very 

 long, the two anterior pairs slender, the others broad, with the 

 basa long, serrated behind. Posterior pleopoda slightly shorter 

 than the fifth pair, the rami broad-lanceolate, serrated. Telson 

 as long as the protopodite of the posterior pleopoda, deeply 

 cleft ; the halves compressed, ending each in two acute spines, 

 of which the outer is much more prominent than the inner. 

 Length about i in. 



Tasmania. (Macleay Museum.) 



This species probably approximates near enough to JE. cuspidatus 

 and E. HelveticB to be placed in the same genus ; although the 

 form of the maxillipedes appears to be rather different. 



Genus Letjcothoe, Leach. 

 Body long, compressed. Antennas simple, subequal. Maxilli- 

 pedes subpediform, unguiculate. Mandibles having an appendage. 



