CTEENID^. 57 



Cyrena cycladiformis, Doshayes, 1824. 



Cyrena cydadiformis. 



" ~ - • - -.24^ Yoi_ i_ pi_ xix. tiga. 7-9, p. 



, p. 14. 



Coq. Foss. Paris, 1824, vol. i. pi. xix. figs. 7-9, p. 121. 

 Mon. Pal. Soo. (Supp.), 1877, pi. b. figs. 11", IP, ; 



Horizon and Localities. 

 Oligocene. — Ileadon Beds. Mead End ; Hordwell. 



Cyrena deperdita, Lamarck, 1806. 



Cyclaa deperdita. 

 Ann. Mus. 1806, vol. 7. p. 421. 



Cyrena deperdita, 

 Mon. Pal. Soc. (Supp.), 1877, pi. d. figs. lO'-lO", p. 1^. 



Horizons and Localities. 



Oligocene. — Headon Beds. Headon Hill. 



Upper Eocene. — Barton Beds. High Cliff; Barton. 



Cyrena Dulwichiensis, Kickman, 1860. 



Cyrena Duhvichiensis. 

 Geologist, 1860, pi. v. tigs. 4, 5, p. 212. (F. E. Edw.ards Coll.) 

 Mon. Pal. Soc. (Supp.), 1877, pi. a. figs. 14"-14'^, p. C. 



Horizon and Localities. 

 Lower Eocene. — Woohoich Beds. Dulwieh ; Pt'ckham. 



Cyrena gibbosula, Morris, 1856. 



Cyrena yibbosida. 

 Forbes's 'Isle of Wight,' Mem. Geol. Surv. 1856, pi. vi. figs. 1.3, 13% 13% 

 p. 156. 



Horizon and Localities. 



Oligocene. — Headon Beds. Mead End ; Hordwell ; Lyndhurst ; Headon 

 Hill. 



Cyrena mactrseformis, Edwards (MS.). 



Horizon and Locality. 

 Oligocene. — Bembridge Beds. Bembridgc. 



Cyrena obliqua(?), Deshayes, 1824. 



Cyrena obliqua. 

 Diet, d'llist. Nat. 1824, vol. 5. p. 200. 

 Coq. Foss. Paris, 1824, vol. 1. pi. xix, figs. 5, 0, p. 122. 



Horizon and Locality. 

 Oligocene. — Headmi Beds. Hordwell. 



Cyrena obovata, J. Sowcrby, 1817. 



Cyclas nbovata. 

 Mineral Conchology, 1817, pi. 162. figs. 6, 6. (Sowerby Coll.) 



