PKOSOBRANCHIATA. EIS80ID*. 231 



Family EISSOIDJ^., Troschel. 



Genus RISSOA (PreminviUe, 1813), A. G. Desmarest, 181 -l. 



Jouni. Mines, 1813, vol. .'U. part 2, p. 87 (list name). 

 Bull. Sci. Soc. Philomat. Paiis, 1814, pi. i. figs. l-(i, pp. 7-9. 



Alvania (Leach, MS.), Risso, 182(5. 

 Hist. Nat. Em-ope me'rid. 1826, vol. 4. p. 140. 



Gakodina, Mouterosato, 1884. 

 Xat. Siciliano (Palermo), 1884, vol. .",. p. l(i:',. 



Rissoa Bartonensis, Charlesworth (MS.). 



Horizon and Localities. 

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



Rissoa cerithiiformis, Edwards (MB.). 



Horizon and Locality. 



Middle Eocene.— Braeklesham Beds. Brarashaw. . 



Rissoa diversa, Edwards (MS.). 



Horizon and Locality. 

 Oligocene. — Hempstead Beds. Hempstead. 



Rissoa globulus, Edwards (MS.). 



Horizons and Localities. 



Upper Eocene. — Barton Beds. High Cliff. 



Middle Eocene. — BracAlesham Beds. Braeklesham Bay. 



Rissoa nana, Lamarck, 1804 and 1806. 



Bulimus nanus. 



Ann. Mus. 1804, vol. 4. p. 20.'? ; 1806, pi. xi. tig. 0. 



Paludina nana. 



Coq. Foss. Paris, 1825, vol. ii. pi. xv. figs. 17, 18, p. 132. 



Rissoa nana. 

 Desc. Anini. sans Vert. 1862, vol. ii. pi. xxiv. figs. 10-12. p. 409. 



Horizon and Localities. 



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



Rissoa obliquecostata, Edwards (MS.). 



Horizon and Locality. 



Oligocene. — Hempstead Bedi. Hempstead. 



Rissoa turbinata, Lamarck, 1804. 



Bulimus tttrbinattis. 



Ann. Mus. 1804, vol. 4. p. 294. 



Bissna turbinata. 



Diet. Sci. Nat. 1827, vol. 4-'). p. 480. 



