AUSTRALIAN MALACOSTBACA. 255 



long as the two first segments of the peduncle of the superior 

 pair ; flagellum longer than the last segment of the peduncle. 

 Anterior gnathopoda small ; propodos ovate, hairy ; palm not 

 denned. Posterior gnathopoda unequal ; left a little larger than 

 the anterior, and of similar form ; right very large ; meros 

 produced inf ero-distally into a short pointed prominence ; carpus 

 sub-triangular ; propodos four times as long as the carpus, slightly 

 broader distally than proximally, greatest breadth about half the 

 length, upper and lower borders nearly straight ; palm oblique 

 with three irregular teeth, the defining one sub-acute, the others 

 blunt ; dactylos short, hooked. Posterior pleopoda with the 

 rami ovate, serrated, armed with seta? on the serrations and at 

 the extremity. Length \ in. 



Port Jackson. 



448. Mcera viridis. A.M. 



Mcera viridis, Haswell, 1. c, p. 333, pi. xxi., fig. 2. 



Eyes round. Superior antennae as long as the cephalon and the 

 first five segments of the pereion ; second joint of the peduncle 

 slightly longer and narrower than the first ; third short ; flagellum 

 rather longer than the last two segments of the peduncle ; 

 appendage half as long as the flagellum, of five elongated articuli. 

 Inferior antennae inserted rather behind the superior pair, their 

 peduncle subequal with the peduncle of the latter, the flagellum 

 not longer than the last segment of the peduncle. Squamiform 

 plates of the maxillipedes bordered with curved spines. Anterior 

 gnathopoda small ; propodos ovate, palm oblique, not defined. 

 Posterior gnathopoda very large ; carpus irregularly triangular, 

 closely applied to the propodos, which is very large (as long as 

 the cephalon and first .three segments of the pereion), oblong, 

 rather broader distally than proximally, the palm transverse, 

 armed with three large compressed teeth; dactylos armed 

 internally with two teeth. Three anterior pairs of pereiopoda 

 subequal in length ; two posterior pairs longer ; basa of the three 

 last pairs more than half as broad as long, minutely serrated ; 

 mera broad, strongly convex behind ; meros, carpus, and propodos 

 serrated and hairy on the borders. Posterior pleopoda biramous, 

 the rami unequal, "phylloid, the larger with three small notches 

 on its outer border, smooth on its inner ; the smaller with both 



