

PLATE XXVI. 



Thetironia (contiii ued) . 



Figs. 



1-8. T. minor (Sow.). Lower Greensand. Sedgwick Museum. 1-5, Crackers, 

 Atlierfiekl. 6, near Atherfield. 7, 8, Ferruginous rock, Shanklin. 

 (P. 167.) 



1. Eight valve. 



2 a, right valve ; b, anterior view. 



3. Eight valve. 



4 a, left valve ; b, dorsal view. 



5. Left valve. 



6. Internal cast of right valve. 



7. Internal cast, a, left valve ; b, dorsal view. 



8. Internal cast of right valve. 



9-14. T. laevigata (Sow.). Upper Greensand, Blackdown. (P. 169.) 



9. Sedgwick Museum. Left valve. 



10. Sedgwick Museum, a, right valve; b, hinge of left valve of the same specimen, 



x li 



11. Museum of Practical Geology, No. 19783. Dorsal view. 



12. Sedgwick Museum. Left valve. 



13. Museum of Practical Geology, No. 19780. a, right valve ; b, portion near 



the posterior margin, x 6. 

 It. Sedgwick Museum. Hinge of right valve, X If. 



Genus — Tellina, Jjinnseus. 



15,16. T. Carteruui, d'Orb. Lower Greensand (Crackers), Atherfield. Sedgwick 

 Museum, Cambridge. (P. 171.) 



15 a, right valve ; b, portion near the anterior margin, x 3 ; c, portion near the 



posterior margin, x 3. 



16 a, left valve ; b, dorsal view of the same ; c, hinge of the same, X If. 



17. T. sp. Lower Greensand (Crackers), Atherfield. Sedgwick Museum. 

 Right valve. (P. 172.) 



18,19. T. striatuloides, Stol. Upper Greensand, Blackdown. (P. 172.) 



18. Sedgwick Museum, a, left valve ; b, posterior part, x 3. 



19. Sedgwick Museum. Interior of right valve. 



