1 am indebted to Mr. Meek, of Washington, to whom I sent sketches of some 

 of these fossils, for comparing them with the works of European authors on the 

 Trias, to which I could not at that time have access in California. Since then, I 

 have been enabled to verify most of his opinions by reference to the fine mono- 

 graphs of Ilauer. W. M. G. 



(18) 



