268 ON AUSTRALIAN AMPIIIPODA. 



sharp spine behind ; carpus hairy ; propodos as long as the 

 cephalon and two first segments of the pereion, ovate, its palm 

 strongly convex, defined by a small tooth, its dorsal border nearly 

 straight. Two anterior pairs of pereiopoda sub-equal, their 

 coxa) little more than half the depth of their respective segments ; 

 meros produced anteriorly at its distal end. Three posterior pairs 

 of pereiopoda hairy, the third pair the shortest, the fourth the 

 longest ; basos narrow, its posterior border serrated and armed 

 with a sharp tooth at the distal end. Lateral plates (epimera) of 

 the three anterior segments of the pleon serrated posteriorly. 

 Fourth pair of pleopoda longer than fifth, both provided with 

 seta3 on the protopodite and rami. Last pair of pleopoda very 

 large, biramous, the rami foliaceous, long- ovate, emarginate ; 

 their margins serrate, the serrations and the extremity armed 

 with seta3. Telson of two short, cylindrical rami, each with one 

 or two setaa. Colour light pink, striped and spotted with crimson. 



Length six lines. 



Hah. Port Jackson ; common at low-water mark and in depths 

 of a few fathoms. 



Mcera spinosa, sp. nov. (PL X., fig. 5.) 



Posterior margin of the three anterior segments of the pleon 

 armed with a few acute teeth or spines. Ooxaa much shallower 

 than their respective segments. Lateral plate of the third segment 

 of the pleon serrated posteriorly. Eyes long-oval. Superior 

 antennre more than half the length of the body ; first segment of 

 the peduncle as long as the cephalon and the first segment of the 

 pereion ; second rather longer ; third very short ; flagellum as 

 long as the peduncle ; appendage nearly half as long as the 

 flagellum. Inferior aiitennpe more than half as long as the 

 superior pair ; third segment of the peduncle equal in length to 

 the first segment of the pereion ; fourth twice as long as the third ; 

 fifth as long as the cephalon ; flagellum as long as the fifth 

 segment of the peduncle. Anterior gnathopoda hairy ; carpus 



