WILLISTON: KANSAS PTERODACTYLS. I3 



which would strengthen the belief that Pteranodon is also an European 

 genus. 



In view of the above, the practice of the American text-books in 

 (ieology in introducing generic names of characteristic fossils as 

 names of the geological horizons whence they come, is very repre- 

 hensible, in my opinion. Even the late edition of Leconte's Elements 

 contains a long list of such names, the greater portion of which have 

 been relegated to the limbo of synonymy by paleontologists. It is 

 greatly to be desired that the name "Pteranodon Beds" shall not 

 become established, so long -as there is the least doubt of the validity 

 of the name itself. 



