180 Mr. G. S. Brady on Marine Ostracoda 



of hairs : colour whitish, semitransparent, with an opaque 

 milk-white central patch and marginal belt. Length 

 3V inch. 



I have much pleasure in inscribing this species to my friend 

 Mr. E. C. Davison, whose untiring diligence in collecting and 

 general interest in all subjects connected with marine zoology 

 have materially helped my own studies in this department. 



Gy there demissa^ nov. sp. (Plate XII. figs. 1, 2.) 



Somewhat similar to C. pellucidaj but much smaller. Seen 

 from the side, oblong, rather higher in front than behind ; 

 greatest height equal to about half the length : anterior ex- 

 tremity broadly rounded, posterior subtruncate, and armed 

 below the middle with four small teeth : superior margin 

 straight, or very slightly curved ; inferior deeply sinuated 

 in front of the middle. Viewed from above, the shell is 

 oblong-ovate, slightly constricted in the middle, broader 

 behind than in front ; extremities obtuse ; width less than 

 the height. Surface covered with closely set rather coarse 

 punctations. Length -^ inch. 



Cythere plana^ nov. sp. (PI. XIII. figs. 7, 8.) 



Valves, seen from the side, elongated, subquadrangular, nearly 

 equal in height throughout ; height considerably less than 

 half the length : anterior extremity evenly rounded ; poste- 

 rior rounded above, obsoletely angular below : superior 

 margin straight ; inferior also nearly straight, but distinctly 

 sinuated in front. Outline, as seen from above, compressed 

 ovate. Surface of the shell smooth and polished, bearing 

 numerous small, distant, rounded papillae, and round the 

 margins several long radiating hair-like lines. Colour dull 

 brown. Length -3V inch. 



Three or four separated valves only of this species were 

 obtained. 



Cythere fumata^ nov. sp. (Plate XII. figs. 13, 14.) 



Carapace compressed. Seen from the side, angular, subreniform, 

 highest in front of the middle ; greatest height equal to 

 more than half the length : anterior extremity broadly and 

 obliquely rounded, posterior subtruncate, slightly produced 

 below : superior margin sloping steeply and in a slightly 

 waved line from before backwards, and terminating in a 

 somewhat produced obtuse angle; inferior margin deeply 

 sinuated in the middle. Seen from above, compressed, sub- 

 hexagonal, widest in the middle, and tapering evenly to the 

 extremities, which are obtusely pointed ; width equal to less 



