I20 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 



Fig. 23 Dinichthys intermedlus Newberry. Cleveland shale ; Ohio Restoration of head shield and dorsal armor- 

 ing of trunki x 1-5. .4X'Z- =^antero-dorsolateral ; C=central; Z)j'I/=dorsomedian ; £t? = external occipital; ^=inargina); 

 j7/0 = median occipital; /*=pineal; /Y^Z = postero-dorsolatcral ; /*(9 = preorbltal ; /'/(9=postorbital ; V?=^ rostral, sometimes 

 identified as "nasal" or " mesethmoid.'* Sensory canals shown by double, overlap by single dotted lines. The markings on 

 the outer (lower) border of the lateral plates indicate the extent of the overlap by the clavicular, which is omitted from this 

 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, 



