261 



26. CYTHERIDEA SEDATA,''' sp. 11. 



PI. i., figs. 10 a, b, c. 



Perfectly smooth aud unornamen ted ; much like some of the 

 foregftiag sub-obloug forms in general outline, but less convex. 

 Anterior end broadly rounded and compressed ; posterior end 

 more convex, and obliquely rounded, curving to join an incurve 

 on the ventral margin. Edge view, narrow-ovate ; end view, 

 compressed-ovate. 



One specimen from the Blue, and one from the Yellow Fullers- 

 earth Clay, Midford. 



27. CyXHERIDE-A EMINULA.f Sp. 11. 



PI. i., figs. 11 a, b, c. 



In general outline this approaches Cythere Blakeana, Jones 

 {Quart. Journ. Gcol. Soc, vol. xl., 1884, pi. xxxiv., fig. 34), but it 

 differs from it in ornamentation considerably, having a few scattered 

 pits instead of a coarse reticulation. Edge view, sharply ovate, 

 apiculate posteriorly ; end view, ovate. Hingement like that of 

 pi. i., fig. 2. 



Two examples ; Blue Fullers-earth Clay, Midford. 



■28. CYTHERIDEA SUBEMINULA, SJ>. n. 



PI. v., figs. 8 a, b, c. 



A form nearly allied to C. eminula (pi. i., fig. 11), but squarer, 

 flatter, and more swollen behind. The surface also differs from 

 that of C. eminula, in being quite smooth. 



One specimen from the base of the Fullers-earth Oolite, 

 between Notgrove and Bourton. In Mr. E. A. VValford's 

 collection. 



29. CYTHERIDEA PENTAGONALIS, sp. n. 



PI. ii, figs. 1 a, b, c. 

 The dorsal margin of this species has a distinct, but short and 



* Quiet or calm. t Rising slightly. 



