PLATE VIII. 



Genus — Pteria, Scopoli. 

 Sub-Genus — Oxytoma, Meek. 



Figs. 



1 — 7. P. {Oxi/toma) Cormieliana (d'Orb.). 1 — 6. Speeton Series (D, 1), 



Speeton. 7. Claxbj Ironstone, Claxby. (P. 57.) 



1. Sedgwick Museum. Left valve. 



2. York Museum. Left valve. 



3. Sedgiviek Museum, a, left valve ; h, postero- ventral portion x 3. 



4. Mr. Lamplugh's Collection. Left valve, portion near ventral margin x 3. 



5. Mr. Lamplugli's Collection. Eight valve. 



6. York Museum. Right valve. 



7. Sedgwick Museum. Right valve. 



8—14. F. {Oxytoma) fcdviafii (Sow.). (P. 59.) 



8 — 10. Folkestone Bods, Folkestone. Sedgwick Museum. Left valves, 8 n, x H ; 



8 6, portion of 8 a x 6. 10 a, x 2 ; 10 6, portion of 10 a x 8. 

 11, 12. Hythe Beds (Bargate Stone), Busbridge. Sedgwick Museum. Right valves. 



X U. 

 13, 14. Gault, Folkestone. British Museum, No. L, 4926. 13, left valve. ]4«, right 



valve ; 14 h, portion of 14 a x 8. 



15. P. (Oxytomn) sp. Totternlioe Stone, Hitcliin. Left valve. Museum of 

 Practical Geolog}-, No. 2338. 15 a X 3 ; 15h, portion x 9. (P. GO.) 



IG. P. {OxytonKi) diihia (Etli.). Totternlioe Stone, Bitrwell. Sedgwick 

 Museum. One of the Tj-pes. Exterior (a) and interior (Ji) of right 

 valve. X 2. (P. GO.) 



17—23. P. (0.v!/tnmn) fpiitiiiu.Ktnta (Romcr). Upper Chalk. (P. Gl.) 



17,18. A. qimdratus zone. West Harnham. Dr. Blackmore's Collection. 17 o, left 

 valve ; 6, portion near mid-ventral margin x 4 ; c, interior ; d, hinge x 3. 

 18, left valve x 2. 



19, 20. Coddeuham. Museum of Practical Geology, Nos. 10788, 12620. 19 a. left 

 valve ; b, portion near the mid- ventral margin x 6. 20 a, left valve ; b, pos- 

 terior car X 2. 

 21—23. Wells. Norwich Museum. Nos. 3249, 3250, 3251. 21 rr, left valve ; 21 6, portion 

 near mid-ventral margin x 3. 22, left valve. 23, right valve and interior of 

 the marginal part of the left valve. 



