258 



' It has also some resemblance to Terquem's Pontocypris suh- 

 deltoidea, Mem. Soc. Geol. France, s^r. 3, vol. iv., 1885, p. 14,. 

 pi. ii., fig. 1, as far as the side view is concerned; but there is 

 no real alliance. 



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



19. OYTHERIDEA PUNCTIPUTEOLATA, sp. n. 



PI. i., figs. 4, a, b, c. 



This form resembles pi. i., fig. 2, in outline, but is longer and 

 narrower, more convex in the middle, and more compressed 

 anteriorly. Surface finely punctate, and marked with upwards 

 of 40 larger pits scattered about. Edge view, acute-ovate, com- 

 pressed anteriorly ; end view, almost circular. Hingement differs 

 from that of pi. i., fig. 2, by not clearly showing crenulations on 

 the teeth at the angles; but on this point we are not well satisfied. 



One specimen ; Blue Fullers-earth Clay, Midford. 



20. CYTHERIDEA TERRyE-FULLONIC.E, Sp. «. 



Cyllieridea perforata, Terquem (non Eoemer). Mem. Soc. GM. 

 France, ser. 3. vol. iv., 1885, p. 28, pi., iv., fig. 8. 

 PI. i., figs. 5 a, b, c. 



Eroad-oblong, ends rounded, the anterior somewhat compressed 

 and rather broader than the posterior, which is slightly rimmed. 



Surface coarsely reticulate, with large and irregularly rounded, 

 shallow meshes. Hingement as in pi. i.,fig. 2. End view, ovate. 



Cytheridea spimdosa, G. S. Brady, Challenger Report, 1880, pi. 

 xxxiii., fig. 6, is probably allied to this form. The name perforata 

 having been used by Eoemer, we refer M. Terquem's species to 

 the form under notice. 



Four specimens from the Blue, and two from the Yellow 

 Fullers-earth Clay, Midford. One valve, from the base of the 

 Fullers-earth Oolite, between Notgrove and Bourton, is in Mr. E.. 

 A. Walford's collection. 



