PLATE III. 



Ceratodus — Mandibular and Palatal Teeth. 



Fig. 



1 (a, b, c). Mandibular tooth of C.polymor pirns, n. sp., from Aust Cliff (Bristol Museum). 

 The internal margin is remarkably lofty. This tooth is connected with 

 more ordinary forms by various examples in the Bristol Museum, 

 particularly by Nos. 158 and 159 (Higgin's Collection). The hinder 

 part of the internal margin appears to have been broken and repaired 

 during life. The oblique surface (x, Fig. 1 a) is worn flat by use. 



2. Mandibular tooth and attached splenial bone of C. polymorphus, from Aust 



Cliff (Bristol Museum). 



3 [a, b). Mandibular tooth and attached splenial bone of C. Hunterianus, Old., 



from Maledi, Central India. See Oldham, ( Mem. Geol. Survey of 

 India,' vol. i, p. 295 (1859), and Miall, « Paleeontologia Indica ' (1877). 



4 [a, b). Mandibular tooth and attached splenial bone of C. Gulielmi? Copied from 



Schlumberger, ' Bull. Geol. Soc. de Prance,' 2e ser., torn, xix, pp. 707, 

 708, pi. xvii (1862). 



5 {a, b, c). Palatal tooth of C. potymorphus, with attached pterygo-palatal bone. 



5 c shows the root of the process for union with the frontal. 





