PLATE IV. 
Nucuta (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 ; 6, posterior view of same. 
3. Museum of Practical Geology, No. 6351. Right valve. 
4. — == = Left valve. Figured by Gardner. 
a, left valve ; 2, posterior of same; ¢, dorsal of same; d, hinge x 2. 
5—8. N. impressa, Sow. Greensand, Blackdown. (P. 23.) 
5. Wiltshire Collection, Woodwardian Museum. Right valve. 
6. _— — — — a, left valve ; 6, dorsal ; ec, posterior. 
7. Wiltshire Collection, Woodwardian Museum. Interior of right valve x 2. 
. Probably the type of \. apiculata, Sowerby. Museum of the Geological Society, 
No. 1564. a, right valve; 4, dorsal view. 
9—16. N. albensis, V’Orb. Gault, Folkestone. (P. 24.) 
9. Museum of Practical Geology, No. 1638. a, right valve; 6, dorsal view. 
10. Wiltshire Collection, Woodwardian Museum. Left valve, 
11. Woodwardian Museum. Right valve. 
12. British Museum, No. 4963. a, left valve; 6, dorsal view. 
13. -- — _— — os 
14. Woodwardian Museum. a, left valve; 6, dorsal view. 
15. Collection of C. J. A. Meyer. a, left valve; 6, dorsal view. 
16. Wiltshire Collection, Woodwardian Museum. Left valve. 
17. N. albensis? dOrb. Greensand, Blackdown. Wiltshire Collection, 
Woodwardian Museum. Right valve. (P. 25.) 
18—21. N. gaultina, Gardn. Gault, Folkestone. British Museum, No. 4970. 
(P. 25.) 
18. a, right valve ; 6, posterior ; ¢, dorsal. 
19. Left valve. 
20. Right valve. 
21. a, left valve, outline; 6, same x 13; ¢, dorsal x 13. 
22—26. N. antiquata, Sow. Greensand, Blackdown. Wiltshire Collection, 
Woodwardian Museum. (P. 26.) 
22. a, left valve; b, dorsal view ; ¢, posterior. 
23. a, right valve; 6, dorsal view. 
24. a, dorsal view ; 8, left valve. 
oa) 
25. Interior of right valve x 2. 
26. Right valve. 
27, 28. N. sp. Chalk Rock (zone of Het. Reussianum), Cuckhamsley. Montagu 
Smith Collection, Woodwardian Museum. Internal moulds of 
right valves. (P. 27.) 
