180%, Mr. G. 8. Brady on Marine Ostracoda 
of hairs: colour whitish, semitransparent, with an opaque 
milk-white central patch and marginal belt. Length 
a inch, 
Ihave 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. 
Cythere demissa, nov. sp. (Plate XII. figs. 1, 2.) 
Somewhat similar to C. pellucida, but much smaller. Seen 
from the side, oblong, rather higher in front than behind ; 
ereatest 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 5); 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 papille, and round the 
margins several long radiating hair-like limes. Colour dull 
brown. Length 34 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 
