DEFINITION AND CLASSIFICATION 7 



oldest snake remains, Helagras, Cope, are stated to 

 approach the Lacertilian type. 



Whether the vertebrae named Symoliophis, 

 Sauvage, from the chalk of France, and Coniophis, 

 Marsh, from the Laramie Cretaceous of North 

 America, are Ophidian, as claimed by their descri- 

 bes, or Dolichosaurian, cannot be decided without 

 further material. 



