28 THE ENTOMOSTRACA OF 



behind ; posterior lobe narrow, depressed, and rounded ; dorsal border slightly arched ; 

 ventral border nearly straight : valves gibbous, smooth, faintly punctate, most convex 

 posteriorly and ventrally. 



Dorsal aspect elongate-ovate ; end-vieiu orbicular. 



The species here described [which was found after the plates were finished] is very 

 near to Cythere Favrodiana, Bosquet (' Mem. Commiss. Carte geol. Neerl.,' p. 80, t. 8, 

 f. 7 ; and ' Mem. Soc. Roy. Liege,' iv., p. 361, t. 1, f. 5) ; its outline, however, is more 

 oval ; its posterior lobe is not so acute ; and its surface is more uniformly convex, and 

 is punctate. It has other allies in C. fiisiforniis. Bosquet, and C. attenuata, presently 

 to be described. 



Cythere consobrina occurs rarely in the Barton Clay, Hampshire. [Mr. F. Edward's 

 Collection.] 



No. 7. Cythere attenuata, spec. nov. Plate V, fig. 11. 



INCH. 



Length, J^ Middle Eocene : Isle of Wight. 



Carapace elongate-ovate, subcylindrical, rounded and slightly tapering anteriorly ; 

 obliquely acuminate posteriorly ; dorsal border slightly oblique, and forming 

 an angle with the posterior border ; ventral border curved ; valves somewhat 

 depressed in front, and produced behind into an angular, suddenly flattened posterior 

 lobe : surface smooth, convex, and marked on the middle of the ventral portion witli a 

 sUght triangular impression [not well shown in the figure] . 



Cythere attenuata approaches C. inornata. Bosquet (Entom. Tert , p. 71, t. 3, f. 7), 

 but is narrower, and more tapering and acute. 



One specimen from the Clay with green sand (No. 29, of Mr. Prestwich's section^) 

 at Alum Bay, Isle of Wight, represents this species. 



[B. Oblong forms of Cythere, proper.] 

 No. 8. Cythere Kostelensis (?), Beuss sp. Plate VI, figs. 14 «, \Ab. 



Cypridina Kostelensis, Reuss. Haidinger's Abhaudl., iii, p. 68, t. 9, fig. 22. 

 CxTHESE Kostelensis, Jones. Quart. Journ. Geol. Soc, x, p. 161, t. 3, fig. 10. 



INCH. 



Leno-th, -\ Middle Tertiary : Austria, &c. 



Lower Eocene : Woolwich, Kent. 



' See above, p. 27. 



