Fias. 
Oo 
6—8. 
9—11. 
WO ey 
PLATE XVII. 
Moptora (continued). 
M. flagellifera, Forbes. (P. 99.) 
1. Upper Greensand, Devizes. British Museum, No. 88,845. Right valve, slightly 
compressed dorso-ventrally. 
2. Upper Greensand, Black Ven. Museum of Practical Geology, No. 6658. Dorsal 
view of both valves, somewhat compressed dorso-ventrally. 
M. undulata (Forbes). Atherfield Clay, Atherfield. The Type. Museum 
of the Geological Society, No. 2088. Left valve. (P. 100.) 
M. (Brachydontes) Guerangeri ? (VOrb.). (P. 101.) 
4. Greensand, Haldon. Mr. W. Vicary’s Collection. Left valve. 
5. Cenomanian (Bed 10), Dunscombe. Mr. Meyer's Collection. a, left valve; }, ven- 
tral of same; c, part of a X 2, 
M. (Brachydontes) vectiensis, Woods. (P. 102.) 
6. Crackers, Atherfield. Woodwardian Museum. a, outline of left valve; b, same 
ae 
7. Atherfield Beds, Peasmarsh. Museum of the Geological Society, No. 2092. 
Right valve. a, outline; b, x 2; c, dorsal x 2. 
8. Atherfield Beds, Littleton Pit, Guildford. Museum of Practical Geology. Right 
valve x 14. Drawn from a wax cast of an external mould. 
M. (Brachydontes) striato-costata (d’Orb.). Greensand, Blackdown. 
(Po 1033) 
9. Mr. Meyer’s Collection. Left valve. a, outline; b, x 2. 
10. Wiltshire Collection. Right valve. a, outline; b, x 3. 
11. Mr. Meyer’s Collection. Left valve. a, outline; b, x 2; c, dorsal x 2. 
Genus—CRENELLA, Brown. 
Crenella bella (Sow.). Crackers, Atherfield. Wiltshire Collection. (P. 
104: .) 
12. Right valve. a, outline; b, x 2. 
13. Left valve. a, outline; b, x 2; ce, dorsal x 2; d, ornamentation from the dorsal 
surface x 6. 
Genus—LitHopomus, Cuvier. 
14. Lithodomus rugosus (7), @Orb. Cenomanian (Bed 10), Dunscombe. Mr, 
Meyer’s Collection. a, left valve; b, dorsal. (P. 105.) 
