260 AUSTRALIAN" MALACOSTRACA. 



455. Megamcera sub-carinata. A.M. 



Meqamasra sub-carinata, Haswell, 1. c, p. 335, pi. xxi., fig. 4. 



Fourth segment of the pleon dorsally bi-carinate, the carinaa 

 projecting posteriorly in the form of compressed teeth. Superior 

 antennaa nearly as long as the cephalon and perion ; first two seg- 

 ments of the peduncle subequal, the first rather stouter ; third very 

 short; appendage minute ; flagellum longer than the peduncle. 

 Peduncle of inferior antennae rather shorter than that of superior 

 pair; flagellum shorter than the last two segments of the peduncle. 

 Anterior gnathopocla stout, propodos small, palm oblique, 

 undefined. Posterior gnathopoda large (in the male) ; meros and 

 carpus short, propodos ovate, narrower distally than proximally, 

 dorsal border nearly straight, ventral strongly convex, bordered 

 with hairs, palm defined by an obscure protuberance. Posterior 

 pleopoda with broad ovate rami, serrated externally, smooth 

 internally, emarginate, tipped with a few setaa. Telson with the 

 segments compressed, conical, emarginate, the extremity armed 

 with two acute teeth and a few bristles. Colour nearly white, 

 covered with minute brown dots, with two or three brown bands 

 on the antennaa. Length -/V in. 



Port Jackson (very common at low water among algre, etc.), 

 Botany Bay ; Port Stephens. 



456. Megamcera suensis. 



Megamoera suensis, Haswell, 1. c, p. 335, pi. xxi., fig. 5. 



This species resembles the preceding in the form of the antenna?, 

 the posterior pleopoda and telson, and in the presence of a similar 

 pair of teeth on the fourth segment of the pleon, but differs from 

 it besides other minor points (1) in the possession of short 

 mesial teeth on the posterior border of the last segment of the 

 pereion and first two segments of the pleon ; (2) in the direction 

 of the palm of the posterior gnathopoda, which is transverse. 

 Length W in. 



457. Megamoera Bceckii. 



Megamcera Bceckii, Haswell, 1. c, p. 336, pi. xxi., fig. C. 



Eyes oblong. Superior antennaa nearly as long as the cephalon 

 and pereion ; first two segments of the peduncle nearly equal in 

 length, third small ; flagellum longer than the peduncle ; 

 appendage composed of four elongated articuli. Inferior antennaa 



