PLATE XIX. 



Genus — Ceassatellites, Krtiger. 



Figs. 



1. C. divisiensis, Woods. Upper Greensand, Devizes. Museum of Practical 

 Geology, No. 16750. a, left valve ; h, dorsal view. (P. 128.) 



2, 3. G. vindinnensis (d'Orb.). Cenomanian (Meyer's Bed, 10), Dunscombe. 

 SedgAvick Museum. (P. 129.) 



2a, left valre ; b, dorsal view; c, ornamentation near the middle of the valve, 



x 4 ; d, ornamentation on the posterior area, x 4. 

 3. Eight valve. 



Genus — Antiionya, Gablt. 



4, 5. A. cantiana, Woods. Folkestone Beds, Folkestone. Sedgwick Museum. 

 Right valves. 5 b, part near the mid-ventral border, X -5. (P. 130.) 



6. A. sp. Lower Greensand (Crackers), Atherfield. Sedgwick Museum. 

 Left valve. (P. 131.) 



Genus — Cyppjna, Lamarch. 



7 L3. G. Saussuri (Brongn.). Lower Greensand (Crackers), Atherfield (except 

 fig. 7, Pema-bed). Sedgwick Museum, except fig. 13. (P. 131.) 



7. Left valve. 



8 a, left valve ; h, dorsal view. 

 9, 10. Left valves 



11 a, light valve; b, dorsal view. 



12. Left valve. 



13. British Museum, No. L 564. Large form, a, left valve; b, dorsal view. 



14. C. Sedgwicld (Walker). Lower Greensand, CTpware. Sedgwick Museum. 

 I ..ft valve. (I'. 133.) 



