Dinichthys halmodeus (Clarke) 



(,SV. plate 2) 

 Page 126 



Fragment showing median occipital region of a large cranial shield. 



Natural size 

 Agoniatite limestone (Marcellus shale); Hendrick's ledge, west of 



Manlius, N. Y. 

 Original in New York State Museum 



Protitanichthys fossatus sp. nov. 



Page M4 



Anterior portion of head shield, seen from the cerebral aspect. Natural 



size 

 Delaware limestone (^ " Corniferous") ; Delaware, O. 

 Original in Museum of Comparative Zoology, Cambridge, Mass. 

 A diagram showing arrangement of cranial plates and course of sensory 



canals will be found in text figure 30, page 146 



