266 ON AUSTRALIAN AMPHIPODA. 



short, of four segments. Inferior antennae with the peduncle 

 rather longer than that of the superior pair ; flagellum as long as 

 the last segment of the peduncle. Anterior gnathopoda with the 

 carpus and propodos sub-equal, both armed with hairs below ; 

 the latter having the dorsal border nearly straight, the palmar 

 border strongly convex and armed with four small teeth. Posterior 

 gnathopoda having the meros, carpus and propodos hairy behind, 

 the meros armed behind with a sharp tooth, the carpus slightly 

 produced at its postero-distal angle, closely applied to the propodos; 

 propodos nearly twice as large as that of the anterior pair ; its 

 dorsal border gently convex ; palm well-defined, toothed. Coxae 

 of the two anterior pairs of pereiopoda much deeper than those 

 of the three posterior pairs. Basos of posterior pereiopoda long- 

 ovate, serrated on the borders ; meros broad, strongly convex, 

 produced to an acute point at its distal and posterior angle ; meros 

 and carpus armed at their distal ends with a few bristles. Fourth 

 and fifth pairs of pleopoda sub-equal ; sixth pair with the 

 protopodite short and broad, the rami broad-lanceolate, and armed 

 along the borders with about twenty bristle-bearing serrations. 

 Telson triangular, blunt, with three small teeth at the extremity, 

 and a notch armed with a single seta near the distal end of the 

 inner border. 



Length five lines. 



Hob. Port Jackson. 



Megamcera diemenensis, sp. nov. (PL XL, fig. 3.) 



First four segments of the pleon each with a pair of strong 

 spines on its posterior margin near the middle dorsal line. Eyes 

 reniform. Superior antennae more than half the length of the 

 body ; first segment of the peduncle stout, as long as the cephalon 

 and the first segment of the pereion, second segment narrower 

 and longer ; third segment short ; flagellum longer than the 

 peduncle ; appendage short, of four articuli. Inferior antennae 

 with the peduncle nearly equal in length to the two first segments 



