PLATE XVI. 
Mopto1a (continued). 
Figs. 
1—3. MM. reversa, Sow. Greensand, Blackdown. Wiltshire Collection, Wood- 
wardian Museum. (P. 94.) 
1. Right valve. 
2. a, right valve; 6, dorsal of both valves. 
3. Ornamentation, a little posterior to the centre of the valve x 4. 
4—6.  M. ligeriensis (dV’Orb.). Perna-bed, Atherfield. (P. 96.) 
4. Wiltshire Collection. a, left valve; b, dorsal of both valves. 
5. Leckenby Collection. a, left valve; b, dorsal of both valves. 
6. Leckenby Collection. Part adjoining middle of ventral edge x 2. 
7—10. M. subsimplea (d@’Orb.). Crackers, Atherfield. (P. 97.) 
7. Leckenby Collection, Woodwardian Museum. Right valve. 
8. Wiltshire Collection, Woodwardian Museum. Left valve. 
9. Wiltshire Collection, Woodwardian Museum. a, right valve; b, dorsal of both 
valves. 
10. Museum of the Geological Society of London (No. 2078). a, left valve; b, dorsal 
of both valves. 
