AUSTKALIAN MALACOSTEACA. 263 



of the peduncle short and stout, second narrower than the first 

 and about twice as long ; third about one-fourth of the length 

 of the second ; flagellum equal in length to the second segment 

 of the peduncle, of eight articuli. Inferior antennae equal to 

 the superior in length ; flagellum as long as the last segment 

 of the 1 peduncle, of six articuli. Anterior gnathopoda with the 

 carpus and propodos sub-equal, the latter ovate, with a few 

 serrations on the borders; palm transverse, dactylos short. 

 Posterior gnathopoda with the carpus rather longer than the 

 propodos — the latter oblong, nearly three times as long as broad, 

 with a few serrations on the borders ; palm transverse, dactylos 

 short. Length ^r in. 



Port Jackson. 



Genus Microdetjtoptjs, Costa. 



Body long and slender. Superior pair of antennae longer 

 than the inferior, and carrying a secondary appendage. Mandibles 

 furnished with an appendage. Gnathopoda subchelate, first pair 

 larger than the second. Third pair of pereiopoda not longer 

 than the two preceding ; fourth pair much, and fifth pair very 

 much longer than the others. Posterior pair of pleopoda 

 biramous. Telson tubular, conical, and tipped with a double 

 vertical apex. [S. B.~\ 



461. Microdeutopus Australia. 



Microdeutopus Australis, Haswell, 1. c, p. 271, pi. xi., fig. 5. 



Superior antennae longer than the cephalon and pereion ; 

 peduncle armed with a few hairs ; first segment nearly as long 

 as the cephalon, stout ; second twice as long as the first, slender ; 

 third very short ; flagellum longer than peduncle, a few short 

 hairs on each articulus. Inferior antennte nearly two-thirds of 

 the length of the superior pair ; peduncle armed with a few hairs, 

 the second joint the longest ; flagellum shorter than the last 

 segment of the peduncle, armed with hooked setae. Anterior 

 gnathopoda large, subchelate ; meros small, narrow ; carpus 

 large, armed with a few scattered hairs ; propodos smaller than 

 the carpus, irregularly quadrate, rather longer than broad, 

 armed with a few hairs ; palm short, scarcely oblique, deeply 

 excavate, minutely denticulated, bounded by a triangular tooth ; 



