APPEARANCE OF VERTEBRATE ANIMALS. 127 



115), so that in this and some other points of structure they 

 may be regarded as colossal Mud-fishes, and they must have 



Fig. 112.— Dental plate of Ceratodns serraius. From the Trias. 



had the same destructive powers, but on a far grander scale. 

 They were besides clothed with heavy armour of bony scales* 

 having some resemblance to that of those mailed fishes of 



Fig. ii3.-Jaws of Dinkhthys /f^rtor/ (Newberry). Laterally compressed : 



one-sixth natural size. 



smaller size already referred to, and indicating that, huge 

 though they were, and formidable in destructive power, they 



