248 AUSTRALIAN MALA.COSTRACA. 



Four anterior pairs of coxa? as deep as their respective segments. 

 First pair of gnathopoda having the carpus inferiorly produced 

 to half the length of the propodos ; propodos ovate, dactylos 

 long. Pereipoda subequal, slender. Posterior pair of pleopoda 

 having two long lanceolate rami. Telson single, squamiform. 



439. Leucothoe commensalis. A.M- 



Leucothoe commensalis, Haswell, 1. c, p. 2G1, pi. x., fig. 3. 



Body large and thick. Cox of the second pereiopoda deeper 

 than the rest. Eyes ovoid, black. Superior antenna? nearly as 

 long as the cephalon and first three segments of the pereion, 

 one-fourth longer than the inferior pair ; first segment of the 

 peduncle very stout, occupying about one-third of the total 

 length ; second rather narrower and slightly longer than the 

 first ; third short ; flagelluin as long as the second segment of 

 the peduncle. Peduncle of inferior antenna? equal in length to 

 the two first segments of the peduncle of the superior pair ; 

 flagellum very short. Maxillipedes stout, pediform. Anterior 

 gnathopoda rather shorter than the posterior ; proximal part of 

 carpus dilated, irregularly heart-shaped ; distal prolongation 

 slender, uniform in thickness to near the end, where it tapers to 

 a fine incurved point ; propodos about three times as broad as 

 the distal process of the carpus, which it equals in length, 

 slightly narrowed distally, armed internally with a row of about 

 fifteen short hairs ; dactylos fully one-third of the length of the 

 propodos. Posterior gnathopoda having the distal process of 

 the carpus nearly half as long as the propodos, parallel-sided, 

 incurved ; propodos equalling in length the cephalon and the 

 first three segments of the pereion, rather more than twice as 

 long as broad, with three small teeth and a row of fine serrations 

 on its palmar border, and a conical tooth on the opposite border 

 at the base of the dactylos ; dactylos not quite half as long as 

 the propodos, uniformly curved. Pereiopoda subequal. Three 

 posterior pairs of pleopoda slender, nearly smooth, the protopo- 

 dite of the fourth pair longer than that of the fifth and sixth, 

 that of the fifth the shortest. Telson elongated; the apex 

 moderately acute. 



Western Port ; Port Jackson ; Port Stephens ; PortDenison; 

 Thursday Island ; Torres Straits. 



