402 DR. G. 8. BRADY ON THE OSTRACODA 
triangular, with rounded angles and broad base, tapering upwards; surface of the 
shell smooth, marked by a few very small, distant punctations, and by exceedingly faint 
longitudinal strie. Length 35 inch (0°5 millim.). 
The shell of the male (fig. 5 ¢) is much more attenuated and tapering at the hinder 
extremity. 
‘This species occurred very sparingly in the two beds of the Sables inférieurs. It is 
very closely allied to (though somewhat different in shape from) C. fulva, a species 
described by myself and Mr. Robertson from dredgings made at the Scilly Islands. I 
have much pleasure in naming this species in honour of M. Ernest Vanden Broeck, not 
only as a personal acknowledgment of his courtesy to myself, but as a tribute to his 
services to science in the investigation of the geology of Belgium &c. 
CYTHERURA corNuTA, Brady. (Plate LXVI. figs. 7 a—7 d.) 
Cytherura cornuta, Brady, Monogr. Recent Brit. Ostrac. p. 445, pl. xxxil. figs. 12-15 (1868) ; Brady, 
Crosskey, and Robertson, Monogr. Post-tert. Entom. Scotland, &c., p. 199, pl. xiii. figs. 23-25 
(1874). 
Carapace of the male, as seen from the side, oblong, rhomboidal, nearly equal in height 
throughout; height equal to half the length; anterior extremity rounded, posterior 
obliquely truncate and produced above the middle into a large obtuse beak ; dorsal and 
ventral margins nearly straight. Seen from above, the outline is ovate, with two rect- 
angular aleeform projections behind the middle; anterior extremity acutely, posterior 
obtusely pointed ; width equal to about two thirds of the length. End view subtri- 
angular, with convex and irregularly crenate sides. Shell-surface sculptured with 
conspicuous waved longitudinal ridges, and having a rectangular transverse ridge near 
the posterior extremity, which ridge ends near the ventral margin in a strong cornute 
projection. Length 35 inch (0°44 millim.). 
One or two examples only of this species have been found in the ‘‘ zone a Bryozoaires ” 
and “zone a Panopwa menardi.” The specimen figured I judge, from its elongated 
form, to have been probably a male. 
Genus CyTHEROPTERON, G. O. Sars. 
Valves mostly subrhomboidal, tumid, unequal, and different in shape, the right more 
or less overlapping the left on the dorsal margin; surface of the shell smooth or 
variously sculptured, punctate, papillose, reticulated, or transversely rugose; ventral 
margin produced laterally into a prominent rounded or spinous ala, posterior extremity 
into a more or less distinct beak ; hinge formed by two small terminal teeth on the 
right, and by a minutely crenated median bar on the left valve. Upper antenne shortly 
setose and composed of five joints; penultimate joint elongated, and bearing on the 
middie of the anterior margin two hairs; lower antenne distinctly 5-jointed. Flagellum 
long. Mandibles of moderate size. Palp 3-jointed. Branchial appendage bearing two 
