254 



One specimen; Yellow Fullers-earth Clay,* Midford. 



The dorsal view (not figured) of this perfect specimen shows 

 the anterior hinge-tubercles usual in Cythere, and the dorsal 

 depression (as in Monogr. Tert. En torn., Pal. Soc, pi. iii., fig. 2 c), 

 hence we are inclined to refer t'liis specimen to Cythere. 



9. CYTHERE (1) SPECIOSA, sp. n. 



PL ii., figs. 10 a, h, c. 



Carapace convex and smooth, sinuous on the dorsal margin, 

 the anterior hinge being prominent. The ventral margin is 

 elegantly outlined with an oblique curve. Anterior end nearly semi- 

 circular ; posterior narrower, with a sharp curve, and distinct 

 rim. Edge view, sub-sagittate ; end view (like that of pi. ii., 

 fig. 8), ovate and compressed dorsally, this depression showing 

 on the front half of the carapace, behind the anterior hinge. 



One specimen (unfortunately lost since the drawing was 

 made) ; Blue Fullers-earth Clay, Midford. 



10. CYTHERE CORROSA, Sp. n. 



PI. ii., figs. 12 a, h, c. 



A short, sub-oblong form, neatly rounded behind, and obli- 

 quely rounded in front, with the dorsal slope meeting the 

 prominent anterior hinge, and forming a shoulder, hence the dorsal 

 edge shows features strongly suggestive of a Cythere. Surface 

 with a rugose, sub-concentric reticulation. Edge view, ovate, 

 slightly compressed at the anterior third ; end view, subcordate. 



One specimen ; Blue Fullers-earth Clay, Midford. 



11. CYTHERE OSCILLUM.t i^p. 11. 



PI. iii , figs. 8 rt, b, c. 

 Sub-oval ; angularly curved and rimmed in front ; angulate 

 with a flattened extremity behind. Ventral margin partly 



* See Geol. 2Jag., June, 1886, p. 272. 

 t A little mask. 



