PLATE XII. 
Cucutnma (continued). 
FIGs. 
1—5, C. glabra, Parkimson. Greensand, Blackdown. (P. 57.) 
la, 6, 2. Wiltshire Collection, Woodwardian Museum. Left valves. 
3. Woodwardian Museum. a, right valve; 4, dorsal view of same specimen. 
4, _ — Left valve. 
5. Elongate variety. Wiltshire Collection, Woodwardian Museum. Left valve. 
6—8. (C. obesa, Pict. and Camp. Gault. (P. 61.) 
6. Folkestone. Wiltshire Collection, Woodwardian Museum. Young form. Right 
valve. 
7. Same locality and Collection. a, left valve; 6, dorsal view of same. 
8. Cambridge Greensand (derived from the Gault). Woodwardian Museum. 
Internal cast. a, left valve ; 6, posterior view. 
