262 



DOUGLASS FOSSIL MAMMALIA 



jugal are but barely united, so that the present specimen comes nearer to Eporeodon (?) 

 in this respect. 



The beds from which this fossil was obtained are undoubtedly older than the Oreo- 

 don beds of South Dakota and very likely correspond to the lower Titanotherium beds ; 

 yet it is very doubtful whether this form is directly ancestral to Oreodon culbertsoni or 

 0. gracilis, though I should say that it is more closely related to the latter. It is more 

 probable that it is ancestral to Eporeodon, and that at least the forms with excessively 

 Large bullae form a separate line from the Unita. But it is difficult to make compari- 

 sons or draw conclusions on account of the chaotic condition of this family. It prob- 

 ably will remain so until some one who can do it properly can have the opportunity of 

 studying the vast amount of material that has been collected and who will undertake the 

 enormous task of " straightening things out." There are about twenty species belonging 

 to this family that have been found only in Montana. 



Measurements. 



Length of skull from anterior ofP 1 to posterior of occipital condyle 



Length from back of M 1 to back of same 



W iill li of skull at fourth premolars 



Width of skull at third molars 



M. 



088 



04!) 



080 



002 



Width of skull just anterior to glenoid surfaces 065 



Height of skull at fourth premolars , 025 



Height of skull at centre of orbits 030 



Height of skull art occiput 033 



Width of skull between middle of orbits 037 



Width of brain-case 0895 



Diameter of orbils, antero-posterior 020 



Diameter of orbits, vertical 020 



Length of P-« 0055 



Width of Pi 0055 



Length of V->- 005 



Width of P* 0077 



Length of M>- 008 



Width of MJ- 010 



Length of M^ : 010 



Width of Mf 011 



Length of M :l 011 



Width of M^ 012 



Limnenetes (?) anceps, sp. nov. 



About two miles from where; I found the type skull of L. platyceps I found several 

 fragments of skulls and mandibles of Oreodontidce. They were found in the same spot, 

 but belong to at least five different individuals. One was a small Agriocheerus, A. mini- 



mus 



s, which will be described in this paper. In the same place were toe bones and part 



