258 AUSTBAHAN MAIACOSTBACA. 



452. Mcera crassipes. 



Maera crassipes, Haswell, 1. c, Vol. v., p. 103, pi. vii, fig. 2. 



Antennae sub-equal, nearly as long as the cephalon and pereion, 

 fringed below with long slender hairs. First pair of gnathopoda 

 with the carpus and propodos sub-equal, their upper border nearly 

 straight, the lower strongly convex. Posterior pair of gnathopoda 

 unequal, the right much larger than the left ; the palm deeply 

 concave, with a minute tooth about its middle, and defined with 

 a second, prominent, acute tooth. Fourth and fifth pairs of 

 pereiopoda very much longer and broader than the rest, the fourth 

 pair the broadest. Rami of last pair of pleopoda broad-lanceolate, 

 rather short. Halves of telson conical, each tipped with a stout 

 spine. 



Port Jackson. 



Genus Megamcera, Spence Bate. 

 Body thick. Dorsal segments of the pleon without fasciculi of 

 spines. Eyes round. Superior antennae long ; inferior about 

 half the length of the superior. Gnathopoda subchelate, the 

 second pair being the larger. Posterior pair of pleopoda biramous. 

 Telson double. 



453. Megamcera Mastersii. 



Megamaera Mastersii, Haswell, 1. c, Vol. iv., p. 265, pi. xi., 

 fig. 1. 



Eyes rather small, oval. Superior antennae more than half 

 the length of the body ; first two articulations of the peduncle 

 subequal ; third small ; flagellum as long as the peduncle ; 

 appendage 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 subequal, 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. Ooxse of the two anterior pairs of 



