PLATE XL. 
THRACIA (continued). 
Figs. 
1—3. TT. Robinaldina ? (VOrb.). Lower Greensand, Atherfield. Sedgwick 
Museum. (P. 242.) 
1. Perna-bed. a, left valve; 6, dorsal view. 
2. Crackers. Left valve. 
3. Crackers. Right valve. 
T. Sancte-Crucis, Pict. and Camp. Gault. Left valves. 4, Folkestone ; 
4—6 
Sedgwick Museum. 5, Black Ven; Museum of Practical Geology, 
No. 23484. 6, Folkestone; Museum of Practical Geology, No. 1662. 
(P. 243.) 
7—9. T.sp. 7,8, Gault, Black Ven; Museum of Practical Geology, Nos. 23482, 
9, Upper Greensand, Blackdown; Museum of 
23483, left valves. 
(P. 243.) 
Practical Geology, No. 19813; a, left valve; 6, dorsal view. 
10—13. T. carinifera (Sow.). Chalk Marl. (P. 244.) 
Sedgwick Museum. Right valves. 
10, 11. Ventnor. 
Museum of Practical Geology, No. 23500, 
12. Chard. 
a, right valve; b, 
dorsal view. 
13. Near Beaminster. Museum of Practical Geology, No, 23499. Ornamenta- 
tion x 12. 
Genus—Purorapomya, Sowerby. 
Sedgewick 
Lower Greensand (Crackers), Atherfield. 
14. P. gigantea (Sow.). 
(P. 246.) 
Museum. Right valve. 
