PLATE XVII. 



MoDiOLA (continued). 

 Figs. 



1,2. M. flagellifera, Forhes. (P. 99.) 



1. Upper G-reensand, 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. 



3. M. undulata (Forl)es). Atlierfield Clay, Atlierfield. The Type. Museum 

 of the Geological Society, No. 2088. Left valve. (P. 100.) 



4,5. M. (Brachydontes) Guerang eri ? (d'Orh.). (P. 101.) 



4. G-reensand, Haldon. Mr. W. Vicary's Collection. Left valve. 



5. Cenomanian (Bed 10), Dunscombe. Mr. Meyer's Collection, a, left valve; 6, ven- 



tral of same ; c, part of a x 2, 



6 — 8. M. {Brachjdontes) vediensis, Woods. (P. 102.) 



6. Crackers, Atherfield. Woodwardian Museum, a, outline of left valve ; b, same 



X 2. 



7. Atherfield Beds, Peasmarsh. Museum of the Geological Society, No. 2092. 



Right valve, a, outline ; b, x 2 ; c, dorsal x 2. 



8. Atlierfield Beds, Littleton Pit, Guildford. Museum of Practical Geology. Right 



valve X 1^. Drawn from a wax cast of an external mould. 



9 — 11. M. (Brachydontes) striato-costata (d'Orb.). Greensand, Blackdown. 

 (P. 103.) 



9. Mr. Meyer's Collection. Left valve, a, outline ; 6, x 2. 



10. Wiltshire Collection. Right valve, a, outline ; 6, X 3. 



11. Mr. Meyer's Collection. Left valve, a, outline; b, x 2; c, dorsal x 2. 



Genus — Ceenella, Brown. 



12,13. Crenella hella (Sow.). Crackers, Atherfield. Wiltshire Collection. (P. 

 104.) 



12. Right valve, a, outline ; b, x 2. 



13. Left valve, a, outline ; 6, x 2 ; c, dorsal x 2; c7, ornamentation from the dorsal 



surface x 6. 



Genus — Lithodomus, Guvier. 



14. Lithodomus rugosus (?), d'Orb. Cenomanian (Bed 10), Dunscombe. Mr. 

 Meyer's Collection, a, left valve ; 6, dorsal. (P. 105.) 



