THE STEREOSPONDYLOUS AMPHIBIA. 



201 



preserved in obverse in the University of Kansas Museum are of considerably 

 greater length than those described by Professor Marsh. The measurements of one 

 of the larger impressions are appended. There appear to be series of footprints of 

 two different animals preserved on the large slab (5 by 7 feet), but their nature is 

 essentially the same. 



MEASUREMENTS OF LARGE FOOTPRINT. 



Length of shortest toe ........................... 65 



Width across heel .............................. 50 



Greatest length ............................... 200 



Greatest width ............................... 90 



Length of longest toe .......................... 120 



The slab is No. 5 of the University of Kansas Museum of Natural History, 

 collected in 1873 by Professor B. F. Mudge at Osage, Kansas, and presented by 

 him to the museum in 1875. 



The following list of Carboniferous amphibian (?) footprints is compiled from 

 Hay's Catalogue of Fossil Vertebrates of North America. It is given here for the 

 sake of completeness. Three types of amphibian footprints are described in the 

 body of this work and they constitute the kind of material which an ichnologist has 

 for the basis of his conclusions. The material is not very satisfactory for the 

 morphologist, though much can be determined as to the foot structure. 



