AUSTBALIAN MALACOSTBACA. 231 



Cephalon with a slight rostral prolongation. Posterior segments 

 of the pleon compressed. Eyes large, round, red. Superior 

 antennae as long as the cephalon and the first three segments of 

 the pereion ; peduncle stout, the second segment produced 

 above into a strong tooth at the distal end ; flagellum longer than 

 the peduncle, tapering, of about seven articuli. Inferior antennae 

 rather longer than the superior pair; peduncle and flagellum 

 subequal. Anterior gnathopoda with the propodos oblong, more 

 than twice as long as broad, the palm oblique, short, armed with 

 a few very short hairs. Posterior gnathopoda with the carpus 

 produced infero-distallyintoa prominent, distally-rounded process, 

 armed terminally with a few hairs ; propodos ovate, narrowed 

 distally, palm oblique, defined by the distal process of the carpus, 

 armed with a few short bristles. Pereiopoda subequal, slender. 

 Last three pairs of pleopoda successively decreasing in length 

 posteriorly ; rami short, pointed, unarmed. Telson very large, 

 laterally compressed, blade-like, nearly as long as the last pair 

 of pleopoda, the upper border convex, the lower nearly straight. 

 Ornamented with numerous brown dots disposed in lines on the 

 lateral shields and the body. Length about tV in. 



Port Jackson. 



Sub-JPamily Lysianassides. 



Superior antennas usually very short, thick at the base, and 

 suddenly tapering. Coxae of the four anterior pairs of appen- 

 dages very deep, the fourth not broader than the preceding. 



Genus Lysianassa, Milne-Edwards. 



Superior antennae pyriform, very short, stouter than the 

 inferior, and furnished with a secondary appendage. Mandibles 

 having an appendage ; the incisive edge not furnished with teeth ; 

 armed upon the anterior margin with a stout tubercle ; secondary 

 or movable plate wanting. Maxillipedes with large squamif orm 

 processes attached to the third and fourth joints. Eirst pair of 

 gnathopoda not subchelate ; second pair subchelate, imperfectly 

 developed, long and membranous. Ischium and carpus long. 

 Dactylos rudimentary. Coxae of the gnathopoda and the two 

 anterior pairs of pereiopoda deeper than their respective seg- 

 ments ; those of the second pair of pereiopoda produced inf eriorly 



