BY WILLIAM A. HASWELL, M.A., B.SC. 103 



the articuli of the flagellum ; the flagellum much longer than the 

 peduncle, of about 30 articuli. The lower antennae are as long as 

 the body. The fourth joint of the peduncle is very long, longer 

 and rather stouter than the second joint of the superior pair, orna- 

 mented with numerous short fine cilia ; the fifth joint is small, 

 about |rd of the length of the fourth ; the flagellum is very long, 

 with nearly 40 articuli. The coxae are ver}'- small. The first 

 pair of gnathopods are a little stouter than the second, the carpus 

 of both is sub-ti-iangular in lateral outline ; that of the second 

 more elongated ; the propodes are similar, sub-triangular, with 

 oblique, slightly concave palm. The pereiopods are slender, 

 with powerful falciform dactyli and stout setae. The third 

 segment of the perion has a short acute tooth on each side on the 

 dorsal portion of its posterior border ; the fourth segment has 

 a strong subacute tooth. The sixth pair of pleopods are large, with 

 lanceolate acute rami, bordered with a few setae. The telson 

 is double, the halves long and narrow, slightly excavated at the 

 extremity. The surface is ornamented with very minute crimson 

 dots. 



Thursday Island, Torres Straits. 



XII. Megamcera suensis. 

 (Plate XV., figs. 1-4.) 



Megammra suensis, Haswell, Proc. Lin. Soc, N.S.W., Vol. IV., 

 p. 335, pi. XXL, fig. 5 ; Cat. Aust. Crust., p 260. 



For a detailed description of the ordinary form of this species see 

 Miers, Crustacea of H.M.S. "Alert," p. 317. 



I give here (pi. XV., figs. 1-4,) figures of a species from Port 

 Stephens which is very nearly related to Meg/amcera suensis, and 

 yet diff'ers from it in several particulars. 



The body is slender, without spines, except on the third segment 

 of the pleon, which has a few minute spines on the posterior border 



