56 Annals of the Carnegie Museum. 



Antero-posterior diameter of M-2- 4 



Transverse diameter of M^ 6 



Length of inferior dentition from M f to and including the canine 38 



Length of inferior premolar series 17 



Length of inferior molar series 16 



Antero-posterior diameter of M T 9.5 



Antero-posterior diameter of heel of M T 3 



Transverse diameter of heel of M T 4 



Antero-posterior diameter of M^ 5 



Transverse diameter of M^ 3 



Antero-posterior diameter of Mj 2 



Transverse diameter of M f 2 



The Upper Harrison (Nebraska) Beds. 



This horizon was definitely located both geographically and geolog- 

 ically by Hatcher in 1902. 19 No Proboscidian remains have as yet 

 been found in this horizon, but the fauna include animals which are 

 much modified, viz. : Merycochcerus and Merychyus among the Mery- 

 coidodonts, and many other forms of the Artiodactyla. Parahippus is 

 well advanced, as are also some of the Carnivora. This horizon has 

 yielded a richer fauna than any of the underlying beds of the lower 

 Miocene in this locality. The horizon should perhaps be regarded 

 as belonging to the middle Miocene. 



List of the Fauna. 

 Parahippus nebrascensis sp. nov. 

 Moropus ? elatus Marsh. 

 Merycochcerus. 



Merychyus minimus, var. nov. 

 Blastomeryx. 

 ? Procamelus. 



Oxydactylus longipes Peterson. 

 Oxydactylus brachyceps Peterson. 

 ? Thinohyus. 

 Cam's vafer Leidy. 



sElurocyon brevifacies, gen. et sp. nov. 

 Testudo hollandi Hay. 20 

 Testudo edce Hay. 20 



19 Proc. Am. Philos. Society, Vol. XLL, p. 117, 1902. 



20 Named and described by Dr. O. P. Hay, Annals of the Carnegie Museum, 

 Vol. IV., p. 18, et seq. 



