PLATE IV. 



Nucula. (continued). 



FIGS. 



1. N. ovata, Mant. Gault, Folkestone. British Museum, No. L 4968. 

 a, right valve; b, dorsal. (P. 21.) 



2 — 4. N\ obtusa, Sow. Greensand, Blackdown. (P. 22.) 



2. The Type, Bristol Museum, a, right valve ; b, posterior view of same. 



3. Museum of Practical Geology, No. 6351. Right valve. 



4. — — — Left valve. Figured by Gardner. 

 a, left valve ; b, posterior of same ; c, dorsal of same ; d, hinge X 2. 



5 — 8. N. impressa, Sow. Greensaud, Blackdown. (P. 23.) 



5. Wiltshire Collection, Woodwardian Museum. Right valve. 



6. — — — — a, left valve ; b, dorsal ; c, posterior. 



7. Wiltshire Collection, Woodwardian Museum. Interior of right valve x 2. 



8. Probably the type of J\\ apinulata, Sowerby. Museum of the Geological Society, 

 No. 1564. a, right valve ; b, dorsal view. 



9—16. N. albensis, d'Orb. Gault, Folkestone. (P. 24.) 



9. Museum of Practical Geology, No. 1638. a, right valve ; b, dorsal view. 



10. Wiltshire Collection, Woodwardian Museum. Left valve. 



11. Woodwardian Museum. Right valve. 



12. British Museum, No. 4963. a, left valve ; b, dorsal view. 



14. Woodwardian Museum, a, left valve ; b, dorsal view. 



15. Collection of C. J. A. Meyer, a, left valve ; b, dorsal view. 



16. Wiltshire Collection, Woodwardian Museum. Left valve. 



17. N. albensis? d'Orb. Greensand, Blackdown. Wiltshire Collection, 

 Woodwardian Museum. Right valve. (P. 25.) 

 18—21. K gaultina, Gardn. Gault, Folkestone. British Museum, No. 4970. 

 (P. 25.) 



18. a, right valve ; b, posterior ; c, dorsal. 



19. Left valve. 



20. Right valve. 



21. a, left valve, outline ; b, same X li ; c, dorsal X 1|. 



22 — 26. N. antiquata, Sow. Greensand, Blackdown. Wiltshire Collection, 

 Woodwardian Museum. (P. 26.) 



22. a, left valve ; b, dorsal view ; c, posterior. 



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

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



25. Interior of right valve X 2. 



26. Right valve. 



27, 28. N. sp. Chalk Rock (zone of Ilet. Beussianum), Cuckhamsley. Montagu 

 Smith Collection, Woodwardian Museum. Internal moulds of 

 right valves. (P. 27.) 



