PLATE IV. 



Fig. 



1. Terebratula resupinata, Sow., marlstone, Ilminster. 



2. ,, „ interior, showing the loop and spines on its 



inner side, facing the front. 



3. 4, 5. „ „ different specimens, from the marlstone of 



Ilminster. 



6. Terebratula Moorei, Bav., marlstone of Ilminster. 



7. ,, ,, from the same locality. 



8. Terebratula impressa, V. Buck., from a specimen found in the Inferior Oolite 



of Cheltenham : this forms a passage 

 from T. resupinata into T. impressa. 



9. 10. „ „ from the Oxford Clay of St. Ives. 



11. Terebratula carinata, Lamarck, Inferior Oolite from near Stroud. 



12. „ „ from a specimen in the collection of the 



Geological Survey. 



13. 14. „ „ two specimens. 



15,16. ,, „ from the Inferior Oolite of Chalford. 



17. ,, ,, young shell. 



18, 19, 20. Terebratula emarginata, Soiv., from the original specimens in the collection 



of Mr. J. de C. Sowerby, Inferior Oolite. 

 21. ,, ,, a malformation. 



