SUB-CLASS V GANOIDEI 87 



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



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A 





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Fig. 15S. 

 Microdon ivagneri, Thiolliere. Upper Jurassic ; Cerin, Ain, France, i/;; "at- size (after Tliiolliere). 



fragments in the Ston'esfield Slate (Bathonian), Oxfordshire. Also Corallian 

 and Kimmeridgian, Hanover and Switzerland. 



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



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

 mandible (B), and anterior teeth of mandible, inner view (C), 

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



Fui. 16U. 



An.omoe.odus muensteri, Ag. sp. Man- 

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

 palatine teeth, oral aspect {BJ, and side view 

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



regular rows, and the large teeth on splenial flanked by three or four irregular 

 rows of smaller teeth. Caudal fin rounded behind, not excavated. 31. liassicus, 

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



