The figures are of natural size unless the amount of enlargement is stated. 



PLATE I. 



Genus Nuoulana, Link. 



FIGS. 



1—3. N. spathulata (Forbes). (P. 1.) 



1. The Type. Atherfield Clay, Atherfield. Mus. G-eol. Soc, No. 2112. 



2. Crackers, Atherfield. Wiltshire Collection, Woodwardian Museum, a, right 

 valve; b, anterior of same; e, same valve x 2. 



3. Same horizon, locality, &c. Left valve. 



4, 5. N. subrecurva (Phil.). Speeton Clay, Speeton. Leckenby Collection, 

 Woodwardian Museum. (P. 2.) 



4. a, left valve; b, anterior view ; c, dorsal. Figured by Gardner. 



5. a, right valve ; b, dorsal view. 



6, 7. N. speetonensis, Woods. Speeton Clay, Speeton. Museum of Practical 

 Geology, No. 6412. (P. 3.) 



(j. a, left valve ; b, ornament X 2. 



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



8—14. N. (7 Yoldia] scapha (d'Orb.). 8—13, Atherfield Clay, Sevenoaks. 

 (P. 3.) 



8. Collection of C. J. A. Meyer, a, right valve; b, dorsal view; e, ornament x 2. 

 Figured by Gardner. 



9. British Museum, No. L 9280. Left valve. 



10. 11. — — Eight valves. 



12. Collection of C. J. A. Meyer. Left valve. 



13. — — Eight valve. 



14. Speeton Clay, Speeton. Woodwardian Museum. Left valve.- 



15 — 17. N. Seeleyi (Gardn.). Speeton Clay, Speeton. (P. 5.) 



15. The Type. Leckenby Collection, Woodwardian Museum. a, left valve ; 6, 

 dorsal view. 



16. Woodwardian Museum, a, left valve ; b, dorsal. 



17. Bed C 3. Collection of G. W. Lamplugh. a, left valve ; b, dorsal outline. 



18—24. N. solea (d'Orb.). Gault, Folkestone. (P. 5.) 



18. 19. Wiltshire Collection, Woodwardian Museum. Eight valves. 



20. Montagu Smith Collection, Woodwardian Museum. Interior of left valve X 2. 

 21—24. British Museum, No. L 4974. 21, 23, and 24, right valves ; 22, left valve. 



25—27. N. Marise (d'Orb.). Gault, Folkestone. (P. G.) 



25. British Museum, No. L 4973. a, right valve; b, dorsal outline; c, same x 2. 

 20. British Museum, No. L 4973. a, right valve; b, same X 3. 



27. Woodwardian Museum. Eight valve. 



28—32. N. lineata (Sow.). 28—31, Greensand, Blackdowu. (P. 7.) 



28. The Type, Bristol Museum, a, right valve; b, dorsal view. 



29. Collection of C. J. A. Meyer. Left valve. 



30. Wiltshire Collection, Woodwardian Museum. Left valve. 



31. — — — a, outline of left valve; b, same 

 X 2 ; c, same, dorsal, x2;d, interior of another specimen, right valve, X 3. 



32. Lower Greensand, Atherfield. Gardner Collection, British Museum, No. L 5109. 

 a, outline of right valve; b, same X 2 ; c, dorsal view X 2. 



33 — 35. N. angulata (Sow.). Greensand, Blackdown. (P. 8.) 



33. Collection of C. J. A. Meyer, a, outline of right valve ; b, same X 4 ; c, another 

 specimen, dorsal view, x 4. 



34. a, outline of right valve ; b, same x 4. 



35. The Types, British Museum, No. 43213. a, outline of right valve; b, same X 3; 

 c, dorsal view of another specimen x 3 ; d, interior of another specimen, right 

 valve, X 3. 



