PLATE L. 



Inoge RAMUS {continned). 

 Figs. 

 ]— G. 7. Jahlatus (Scliloth.)- Middle CLalk. (P. 281.) 



1. Locality uukuowu. Britisli Museum, No. L20943. Left valve. 

 2, 3. Eastbourne. Sedgwick Museum. 2, Left valve. 3, Kiglit valve. 



4. Zone of BhynchoneUa Cuvieri, Blanc Nez, Pas de Calais. Sedgvrick 



Museum. Hinge and anterior margin of right valve. 



5. Plumptou. British Museum, No. 586L The specimen figiued by Mantell, 



Foss. S. Downs, pi. xxvii, fig. 3, p. 216. Kight valve. 



6. Middle Chalk, near Warminster. Dr. Blackmore's Collection. Right 



valve. 



