82 



CRETACEOUS LAMETJJT5RAXCHTA. 



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Fig. 11. — Gervillia nlse/ormis (Sowerby). Right valvp, and uinlio and ligament area of the left valve 



of the siiecimen shown in fif:fs. !>, 10. x J. 



Fios. 12, l.'i. — Gervillia alirformis (Sowerby). Lower Grecnsancl (Craclcers), Atherfield. Sedgwick 

 Museum. 12. Left valve. 13. Rii,'ht valve, x J. 



