NEW YORK STATE MUSEUM 



hesitation as a "parietal" in Dinichthys does not occur, an examination of 

 many well preserved cranial shields by the present writer having determined 



nd shale ; Ohio Restoration of head shield ai 

 /)^/=dorsoiiiediaii; £<:'= external occ 

 1; /"O-preorbital; /V6' -postorbital ; I 



;he overlap by the clavicular, whic> 



diagram. (From Hussakof, 1905) 



this point conclusively. In both genera a sclerotic ring is present, the sub- 

 orbital plate is distinct, and followed behind by one, or possibly two, 



