PLATE XU. 



PAGE. 



Fig. 1. Dinichthys Clarki 607 



Showing slender right mandible with thin flange of bone rising at back of the 

 front tooth. 



Fig. 2. Coccosteus Cuyahoga 615 



Part of right mandible, outside view; a shows the bases of three symphysial teeth. 

 Fig. 3. Gorgonichthys Clarki -, 614 



Outside view of right mandible showing groove worn by upper tooth in which it 

 was lying when found; a shows the tooth of the upper jaw fitting on the double 

 point of the mandible. 



