PLATE II. 



Fig. 



1. 1", l 6 . Terebratula grandis, Blum., from a specimen, in the collection of Mr. Bowerbank, 



Cor. Crag of Sudbourn. 



2. ,, „ Interior of larger valve. 



3. „ „ Interior of smaller valve, showing the length of the loop 



(not complete). 



4. „ „ A circular variety. 



5. 6, 7. „ „ Young specimens. 



8. „ „ Enlarged beak of fig. 5, showing the disunited deltidium 



at that age. 



