PLATE XL. 



Theapia (rontiniiPfl). 

 Figs. 



1 — 3. T. Rohinaldina ? (d'Orb.). Lower Greensand, Atlierfield. Sedgwick 

 Museum. (P. 242.) 



1. Pema-hed. a, left valve; h, dorsal view. 



2. Crackers. Left valve. 



3. Crackers. Eight valve. 



4 — 6. T. Sanctss-GrucAs, Pict. and Camp. Gault. Left valves. 4, Folkestone ; 

 Sedgwick Museum. 5, Black Ven ; Museum of Practical Geologj^ 

 No. 28484. G, Folkestone; Museum of Practical Geology, No. 1002. 

 (P. 243.) 



7—9. T. sp. 7, 8, Gault, Black Ven ; Museum of Practical Geology, Nos. 23482, 

 23483, left valves. 9, Upper Greensand, Blackdown ; Museum of 

 Practical Geology, No. 19813; a, left valve; h, dorsal view. (P. 2 13.) 



10—13. T. carinifera (Sow.). Chalk Marl. (P. 244.) 



In, 11. Vontnor. Sedgwick Museum. Eight valves. 



12. Chard. Museum of Practical Geology, No. 23500, a, right valve; h, 



dorsal view. 



13. Near Beaminster. Museum of Practical Geology, No. 23499. Oruameuta- 



tiou X 12. 



Germs — Phoi.a pomya, Sowerhy. 



14. I', fiigantea {?>o-w.). Lower Greensand (Crackers), Atlierfield. Sedgwick 

 Museum. Right valve. (P. 246.) 



