146 



NEW YORK STATE MUSEUM 



The actual condition of the type specimen may be seen from the photo- 

 graph reproduced in plate 10, figure 2 ; in addition, an outline restoration is 

 here offered, which it is hoped will be of service in comparing the arrange- 

 ment of cranial plates and sensory canals, as far as these are discernible, 

 with other Coccosteans. The specific title has reference to the conspicuous 

 pineal foramen, placed slightly posterior to the middle of the plate. Two 



EO 



MO 



EO 



Fig. 30 Protitanichthys fossatus sp. nov. Ulsterian ; Delaware, Ohio. 

 Restoration of head shield, x %. C^central; .£'(9=external occipital ; vl/=marginal ; 

 MO^med'isin occipital; /"^pineal ; /^t?=preorbital ; /*/C=postorbital ; yC^rostral. 

 Sensory canals shown by double dotted lines. Original in Mils Comp. Zool. 



Other prominent fossae, corresponding to those in Dinichthys, occur in line 

 with the pineal on the underside of the preorbitals, and these appear to 

 have been bounded by a low transverse ridge in front. Whether or not 

 vomerine teeth were attached in this vicinity can not at present be deter- 

 mined. Analogy, our only guide, would lead us to expect that they had 

 been. 



Formation and locality. Delaware limestone (Ulsterian); Delaware, O. 

 Holotype preserved in the Museum of Comparative Zoology at Cambridge, 

 Mass. 



