AUSTRALIAN MALACOSTRACA. 273 



as the cephalon and the first six segments of the pereion ; flagellurn 

 subequal with the last segment of the peduncle, of three articuli, of 

 which the first is much longer than the other two ; no appendage. 

 Inferior antenna equal in length to the superior pair ; flagellurn 

 scarcely half as long as the last segment of the peduncle, obscurely 

 multiarticulate. Anterior gnathopoda very small, fringed with 

 long hairs ; propodos long-ovate ; palm undefined ; dactylos 

 neaidy as long as the propodos. Posterior gnathopoda very large, 

 basos stout ; meros produced below into an angular protuberance ; 

 carpus sub-quadrate ; propodos ovate, dilated, dorsal border 

 strongly convex, palm defined by a prominent acute tooth, and 

 occupied distally by a rounded eminence ; ventral borders of 

 the meros and propodos ornamented with a close fringe of long 

 plumose hairs. Fourth pair of pleopoda with the outer ramus 

 much shorter and narrower than the inner ; both tipped with a 

 few short bristles. Fifth pair with the outer ramus styliform, 

 armed with one or two hairs at the apex, the inner foliaceous, 

 long-ovate, bordered internally with a few hairs. Nearly colour- 

 less, with minute brown spots and a transverse brown band on 

 the cephalon at the base of the superior antennae. Length iV in. 



Port Jackson. 



475. Cyrtophium? hystrix. A.M. 



Cyrtopliium ? hystrix, ITaswell, I.e., Vol. v., p. 101, pi. vii., 

 fig. 3. ' 



Cephalon, pereion and first two segments of pleon armed with 

 prominent spines on the dorsal and lateral surfaces ; lateral 

 borders of the second to the sixth segments of the pereion pro- 

 duced outwards and upwards, acuminate. Coxa? of the pereiopoda 

 each armed with a small point on its lower border. Antenna? 

 stout ; superior pair as long as the cephalon and pereion, basal 

 joint of the peduncle short, with an acute spine above ; third 

 joint the longest ; flagellurn shorter than the last segment of the 

 peduncle ; inf ei'ior antennae longer than the superior pair, very 

 stout, fifth joint of the peduncle longer than the fourth, flagellurn 

 much shorter than the last segment of the peduncle. Anterior 

 gnathopoda with the carpus and propodos sub-equal, both armed 

 ventrally with a row of seta>, palm straight, oblique ; dactylos 

 longer than palm. Posterior gnathopoda with the carpus very 

 small, the propodos large, ovate, narrower at its distal than at its 



