174 
BRITISH ENTOMOSTRACA. 
prominent teeth. The shell is white, and the surface is 
grooved longitudinally, the grooves being marked with 
rows of impressed punctures. 
Approaches near Cytherina scrobiculata of Munster, 
vid zBoemers ‘ Cytherinen/ &c., in Jahrbuch fur Mineral., 
1838, t. 6, f. 1. 
Hab . — Along with numerous specimens of C. nigrescens, 
marked as coming from Boston, Torquay, and Arran, one 
single specimen of this pretty species was sent to me by 
W. C. Williamson, Esq. 
15. Cythere con vex a. Tab. XXI, fig. 3. 
Shell rounded, very convex, and presenting very much 
the appearance of a small Cypraea, or Cowrie shell. The 
surface is covered with numerous small, white, raised dots 
or points, which are disposed in radiating rows round the 
circumference, and the whole shell is of a white colour, 
and translucid. The margin of the shell is somewhat 
waved. 
Hab. — Torquay, in sand; W. C. Williamson, Esq. 
Tenby, in sand, T. R. Jones, Esq. 
Genus 2 — Cythereis. 
Cythereis, : T. R. Jones, Entomost. of Cretac. Format., 1849. 
Cythere, Munster , Jahrbuch fur Mineralogie, 1880. 
— Cornuel, Mem. Geol. Soc. France. 
Cytherina, Roemer, Jahrbuch, &c., 1838. 
— Reuss, Yerstein. Bohm. Kreideform. 
— Williamson , Transact. Manch. Lit. Soc. 
Cypridina, Bosquet , Mem. Soc. Boy. Liege, 1847. 
Animal unknown. Carapace valves or shell of an 
almost regular oblong shape, the dorsal and ventral mar- 
gins lying nearly parallel to each other. Surface of a 
very irregular appearance, being wrinkled, ridged, and 
beset with tubercles, and crenulated or strongly toothed 
on the margins. 
