BY WILLIAM A. IIASWELL, M.A., B.SC. 265 



tootli and a few hairs. Superior antenna) as long as the cephalon 

 and pereion ; first two segments of the peduncle elongate, second 

 longer than the first ; third segment very short ; flagellum rather 

 shorter than the peduncle ; appendage seven-jointed. Inferior 

 antenna) with the peduncle equal in length to that of the superior 

 pair ; first segment the shorter, second the longest ; flagellum 

 about equal in length to the last segment of the peduncle. 

 Anterior gnathopoda with the carpus and propodos subequal, 

 hairy ; the latter broad ; palm oblique, armed with a few short 

 denticles. Posterior gnathopoda unequal : right the largest, its 

 carpus closely applied to the propodos ; propodos more than thrice 

 as long as that of the anterior pair, oblong, slightly longer distally 

 than proximally, its length equal to nearly twice its least breadth; 

 palm nearly transverse, defined by a strong, pointed, slightly 

 curved tooth, and armed Tvith three other large compressed teeth : 

 left with the propodos about two-thirds of the length of that of 

 the right, of similar shape, but having the palm rather more 

 oblique, slightly convex, minutely crenulated, armed with a single 

 small defining tooth. Three posterior pairs of pereiopoda serrated 

 and hairy, rather shorter than the fourth and fifth. Posterior 

 pleopoda (wanting). Telson with each division armed terminally 

 with a sharp tooth and a few long hairs. 



Length five lines. 



Ilab. Port Jackson (dredged). 



I have named this species after Mr. E. P. Eamsay, Curator of 

 the Australian Museum, Sydney, to whom I am indebted for the 

 loan of specimens of this and of several other species herein 

 described. 



Genus Megamosba, Spence Bate. 

 Megamcera Mastersii, »p. nov. (PL XI., fig. 1.) 



Eyes rather small, oval. Superior antenna) more than half the 

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

 equal ; third small ; flagellum as long as the peduncle ; appendage 



