SüB-CLASS V GANOIDEI 87 



Stone) of Bavaria and France, and in the Purbeck Beds of England. Earliest 



i 



Fig. 158. 

 Microdon icagneri, ThioUiere. Upper Jurassic ; Cerin, Ain, France. 1/3 nat. size (after Thiolliere). 



fragments in the Stonesfield Slate (Bathonian), üxfordshire. Also Corallian 

 and Kimmeridgian, Hanover and Switzerland. 



Mesodon, Wagner. As Microdon, but teeth on vomero-palatine in five 



Fig. 151». 

 Microdon elegans, Ag. Vomeropalatine (A), splenials of 

 mandible (B), and anterior teeth of niandible, inner yiew (C), 

 and outer view (D), nat. size. Upper Jurassic ; Kelheim. 



Fig. 160. 



Anomoeodiis viuensteri, Ay. sp. Man- 

 dibular (splenial) teeth (A), and vomero- 

 palatine teeth, oral aspect(£), and side view 

 (C), nat. size. Greensand ; Kelheim. 



regulär rows, and the large teeth on splenial flanked by three or four irregulär 

 rows of smaller teeth. Caudal fin rounded behind, not excavated. M. liassiciis, 

 Egert. sp., from the Lower Lias of England, is the oldest known Pycnodont, the 



