Dinichthys halmodeus (Clarke) 



(^See plate 2) 

 Page 126 



1 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 144 



2 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 



314 



