PLATE III. 



Nucula {continued). 



FIGS. 



1 — 12. N. (Actio) bivirgata, Sow. Gault, Folkestone (except f. 12). (P. 19.) 



1. Woodwardian Museum. Right valve X If. 



2. British Museum, No. L 5907. a, outline of left valve; b, same X 1| ; «, dorsal 

 outline. Figured by Gardner. 



3. Wiltshire Collection, Woodwardian Museum. Right valve x If. 



4. British Museum, No. L 5907. Left valve x 11. Figured by Gardner. 



5. — No. L 4972. a, right valve ; b, posterior end ; c, dorsal X If. 



6. — — Left valve X l\. 



7. — — Median portion of left valve x If. 



8. — — Median portion of right valve X If. 



9. — — Left valve x If. 



10. No. L 5102. Hinge of right valve x 2. 



11. Collection of C. J. A. Meyer. Antero-ventral portion of left valve X 6. 



12. Cambridge Greensand. Woodwardian Museum. Internal mould, right valve. 



13. N. pectinata, Sow. Cambridge Greensand (derived). Woodwardian 

 Museum. Internal mould, a, right valve ; b, dorsal view. 

 (P. 10.) 



14, 15. N. pectinata, var. cretse, Gardner. Greensand, Blackdown. Museum of 

 Practical Geology. The Types of var. cretse,. (P. 18.) 

 14. «, riyht valve ; b, dorsal (No. 6419). 

 15. Left valve (No. 6450). 



16—21. N. ovata, Maut. Gault, Folkestone. (P. 21.) 



16. British Museum, No. L 4968. Right valve. 



17. Wiltshire Collection, Woodwardian Museum. Right valve. 



18—20. British Museum, No. L 4968. 18, right valve. 19. a, left valve ; b, dorsal 



view ; 20, right valve. 

 21. Woodwardian Museum, a, right valve ; J, dorsal. 



