FIGS. 
1S Pe 
sw) 
a 
8—12. 
0. 
C. 
Led bys) 2G 
CucuLnaa (continued). 
(Dieranodonta) donningtonensis, Keeping. Claxby Ironstone (zone 
of Belemnites lateralis), Benniworth Haven. Woodwardian 
Museum. (P. 54.) 
1. a, left valve; 6, interior. 
2. Right valve. 
(Dicranodonta ?) obliqua (Keeping). Lower Greensand, Upware. 
Woodwardian Museum. (P. 55.) 
3. a, right valve, outline; 4, same x 13; ¢, dorsal. 
4. Left valve, interior. 
. venusta, Nyst. Greensand, Blackdown. (P. 56.) 
5. The Type, Bristol Museum. Left valve. a, dorsal outline; 6, outline; c, same 
x 2. 
G. The Type, Bristol Museum. Left valve. a, outline; 0, same x 2. 
7. Collection of C. J. A, Meyer. a, right valve x 3 (the outer layers of the shell 
are absent, so that the apparent ornamentation differs from that in figs. 5 and 6) ; 
6, dorsal view of same X 3. 
glabra, Parkinson. Greensand, Blackdown. (P. 57.) 
8. British Museum, No. 26926. a, left valve; 0, dorsal of same specimen; c¢, orna- 
mentation x 6. 
9. Wiltshire Collection, Woodwardian Museum. 4, left valve; 6, dorsal view. 
10. Woodwardian Museum. Hinge of the left valve of a young form x 4. 
11. Wiltshire Collection, Woodwardian Museum. Hinge of right valve—later stage 
than fig. 1O— x 2. 
12. Woodwardian Museum. Hinge of right valve x 13. 
