EXPLANATION OF PLATE XLVII. 



Muzzles and crania o{ Saurodontida;, natural size. 



Fig. 1. Inferior view of vomer and ethmoid bones of Portheus Icstrio, Cope, obliquely depressed, display- 

 ing cotyli for the maxillary and premasillary condyles. 



2. Inferior view of vomer and ethmoid of an unknown species, not distorted. 



3. The same view of Duptinun x^hlcholomus. 



4. Superior view of the same specimen. 

 ."J. Profile of an unknown Saurodont. 



6. .Suijerior view of ethmoid of Duptiii us phhhotomm, Cope. 



7. Inferior view of cranium of Portheus larcuatus. 



8. Superior view of the same cranium. 



9. Palatine bone, with malleolar body, of Portheus arcuatus, from the outer side. 



