306 



THE OXFORD OOLITE PERIOD. 



CHAP. 



Among these few fishes the most remarkable is the Ischyodus 

 Egertoni of Agassiz, of which good jaws have been collected from 

 St. Clement's, in the upper Oxford clay. I have endeavoured to 

 give clear views of the internal and external aspects of these re- 

 markable bones, which are also teeth, and represent in the old 

 world such curious creations as the Diodon of modern seas. See 

 Plate XII. For descriptions I must refer to Agassiz's great work 

 on Fossil Fishes. 



REPTILIA. 



Dakosaurus. O. C. St. Clement's. 



Ichthyosaurus dilatatus. n. s. Phil. O. C. St. Clement's. 



thyreospondylus. Owen. O. C. Buckingham. 



Megalosaurus Bucklandi. O. C. Near Oxford. C. 0. Littlemore, Dry-Sandford. 

 Pleiosaurus gamma. Owen. 0. C. St. Clement's. 



grandis. Owen. O. C. Peterborough. 

 Plesiosaurus eurymerus, n. s. 0. C. Bedford. 



Oxoniensis. n. s. Phil. 0. C. Summer-town, St. Clement's, &c. 



plicatus. 0. C. Summertown. 



trochanterius. Owen. 0. C. Chippenham. 



Ehamphorhynchus Bucklandi. 0. C. St. Clement's. 

 Steneosaurus . . . 0. C. Long Marston. 

 Streptospondylus Cuvieri. Owen. O. C. Near Oxford. (See p. 319.) 



EEFERENCE TO PLATE XII., EEPEESENTING FOSSILS OF THE 



OXFOED CLAY. 



1. Anabacia orbulites. 



2. Diastopora diluviana. 



3. Terebratula impressa. 



4. Gryphaea dilatata, with attached 



Serpula tricarinata. 



5. Nucula elliptica. 



6. Alaria bispinosa. 



7. Belemnites hastatus. 



8. sulcatus. 



9. Ammonites Duncani. 



10. biplex ? 



11. oculatus. 



12. canaliculatus. 



13. Gowerianus. Jun. 



14. Mariae. 



15. Lamberti. 



16. vertebralis. 



17. Glyphea Stricklandi. 



1 8. Hybodus polyprion. 



19, 20. Hybodus grossiconus. 



21. Hybodus grossiconus. Spine. 



22. Leptacanthus. Spine. 



23. Jaw of Gyrddus ? 



24. Ischyodus Egertoni, seen on the outer 



face a, inner face b. 



25. Tooth of Pleiosaurus. 



26. Tooth of Pleiosaurus. 



27. Tooth of Saurian. 



28. Tooth of Saurian. 



29. First phalanx, wing finger ofEham- 



phorhynchus. 



30. Proximal articular face of the same 



phalanx. 



31. Femur of Ehamphorhynchus. Side- 



ways. 



32. The same seen in front. 



33. Distal articular face of the same. 



