VERTEBRATES. 239 



Vertebrate Tracks. 



Beside ihe remains of hard parts of vertebrates mentioned, 

 it is of great interest to note the recent discovery of large num- 

 bers of vertebrate tracks in the shaly sandstones of the Upper 

 Coal Measures at Kansas City. Quite a variety are represented. 

 Most of them are small, none over three or four inches across, 

 and the greater part of them not over a couple of inches in 

 transverse measurement. In all respects they are very similar 

 to the Connecticut valley tracks, only smaller. Full mention 

 will be made of these footprints in another place. 



