106 



GASTEROPODA. 



Cassis spinosa, Edwards (MS.). 

 Horizon and Locality. 

 Lower Eocene. — London Clay. Basingstoke, 



Cassis substriata, Edwards (MS.). 



Horizon and Loadities. 



Lower Eocene. — London Clay, Hampstead Tunnel; Potter's Bar; Cla- 

 rendon ; Alum Bay (no. 4 Bed). 



Cassis sulcaria (?), Deshaj'cs, 1 8G5. 



Cassidaria sulcaria. 

 Desc. Anim. sans Vert. 18C5, vol. iii. pi. xcii. iigi!. 17, IS, p. 477. 



Horizons and LAtcalities. 



Middle Eocene. — liracklesham Beds. Braeklesham Bay. 

 Lower Eocene. — London Clay. Hampstead Tunnel. 



Cassis tessellata, Edwards (MS.). 



Horizon and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Cassis venatrix, Edwards (MS.). 



Llorizcm and Locality. 



Middle Eocene. — Braeklesham Beds. IIuntinKbridsre. 



Family PLEUKOTOMID^, Stoliczka. 



Genus PLEUROTOMA, Lamarck, 1799. 

 M^m. Soc. Hist. Nat. Paris, 1799, p. 73. 



* Section I. Shells fusiform. 



A. Sinus in the posterior margin of the ivhorl. 



a. Canal elongated. 



Pleurotoma acuminata, J. Sowerby, 1816. 



Plcurotoma acuminata. 

 Jlineral Conchologv, 1816, pi. 146. fiir. 4. (Sowerbv Coll.) 

 Mon. Pal. Soc. 1856, pi. xxvii. figs. S'-3^ p. 230 (figs. S^ 3", F. E. Ed- 

 wards Coll. ; tigs. 3", 3'^, Wetherell Coll.). 



* These divisions were originally proposed by Desliayea (Coq. Foss. Paris, 1833, 

 vol. ii. p. 432), and subsequently adopted, in their present form, by F. E. Edwards (Mon. 

 Pal. Soc. 1856, p. 207). 



