PLATE V. 



Ceratodus. 



Fig. 



1 (a, b). C. polymorphus, n. sp., palatal tooth, from Aust Cliff. (Bristol Museum.) A 



curiously distorted specimen, with the prominences worn flat ; broken. 

 2. " C. lavissimus," palatal tooth, from Upper Keuper Sandstone of Ripple, 



Worcestershire. (British Museum.) 



3 (a, b). C. parvus, Ag., mandibular tooth, with attached bone, from Aust Cliff. 



(British Museum.) Five denticles. 



4 {a, b). C. parvus, palatal tooth, from Aust Cliff. (Bristol Museum.) Remarkable 



for the depth of the external margin and the prominence of the ridges. 



5. C. polymorphus ?, mandibular tooth, from Aust Cliff. (Bristol Museum). A 



possible link between polymorphus an&parviis. 



6. C. parvus, palatal tooth, from Aust Cliff. (British Museum.) 



7. C. parvus, mandibular tooth, from Aust Cliff. (British Museum.) 



8. C parvus ?, from Aust Cliff. (Bristol Museum.) Both ends imperfect. 



9. C. parvus ?, palatal tooth, from Aust Cliff. (Bristol Museum.) 

 10. C. parvus, palatal tooth, from Aust Cliff. (Bristol Museum.) 



11 {a, b). Ceratodus (sp. ?), from Maledi, Central India, with attached splenial bone 



(see p. 30). 



12 (a, b). Ceratodus (sp. ?), from Maledi, with attached pterygo-palatal (see p. 30). 



13. C. Phillipsii, Ag.? Stonesfield Slate? (British Museum). (See pp. 26, 32). 



14. C. Phillipsii. Outlined from Agassiz's figure. P. F., torn, iii, pi. xix, 



fig. 17. 



15. C. serratus, Ag. Keuper of Argovie. Outlined from Agassiz's figure. 



P. F., torn, iii, pi. xix, fig. 18. (See p. 30, supra). 



