Eobasil&w. Copo:* Pr. Am. Phil. Soc. 1872, IS"), published in advance August 

 20, 1S72; ibid. 1872,512; ibid. 1873, published as a separate pamphlet, "On 



the Short -Footed Ungulata of the Eocene of Wyoming," March 14, 18.73; Pr. 

 Ac. Nat. Sc. 1873, 10, 102; American Naturalist, March 1873, 180. 



Loxolophodon. Cope: Pr. Am. Phil. Soc. 1872, 487, 488, published in advance 

 August 22, 1S72. Here regarded as the same genus first named in the Pro- 

 ceedings of February 10, 1872, 420, and founded on the tooth of an animal 

 about the size of the American tapir, referred to Bathmodon semicinctus and 

 then to Loxolophodon. Pr. Am. Phil. Soc. 1872, 580; Pr. Ac. Nat. Sc. 187.;, 

 102. 



Lefalophodon. Typographical error '2 Cope: Pr. Am. Phil. Soc. 1872, 515. 



Dinoceras. Marsh : Am. Jour. Sc. 1872, IV, 344, published in advance September 



27, 1872 ; ibid. 1873, V, 117-122, Plates I, II, published in advance January 



28, 1873 ; ibid. April, 1873, published in advance March 18, 1873 ; American 

 Naturalist, March 1873, 146. Nature, March 13, 1873, 3GC. 



Loxolophodon. Cope: "On the Short-Footed Ungulata of the Eocene of 

 Wyoming," read before the Am. Phil. Soc, Feb. 21, 1873, and published in 

 advance of the Proceedings, March 14, 1873. The name is here used as that 

 of a genus recognized as distinct from the one originally described under the 

 same name, which the author now regards as a synonym of Bathmodon. 



All the above names I suspect to have been applied to members of the 

 same genus, and in this view have regarded them as synonyms to. the 

 first characteristic generic name employed. Of this, however, I am by 

 no means positive, as I have had no opportunity of examining the 

 different fossils upon which the genera were founded, except those, 

 described by myself under the name of Uintatherium robustum, and the 

 skull described by Professor Cope under the name of Loxolophodon cornutus. 



In addition, We have the description and figures of the skull described by 

 Professor Marsh under the name of Dinoceras mirabilis. 



As far as I am able to estimate the differences which have been indicated 

 by the authors just named and those observed by myself, they appear to be 

 rather. of specific value, and perhaps in part of sexual character, than of 

 generic importance. We hope, however, that all obscurity in relation to the 

 matter will be cleared away when Professor Marsh and Professor Cope 

 present to us full descriptions with characteristic figures of the fossils in. 

 their possession. I may add it is not improbable that the names of 

 Uintatherium, Tinoceras, Eobasileus, Dinoceras, and Loxolophodon, may be 



* The dates given as those of Professor Cope's publications in advance of the dif- 

 ferent periodicals named are taken from the publicatious themselves ; but they are, 

 in some instances, contested by Professor Marsh. See an article read before the 

 Philadelphia Academy of Sciences April 8, 1873, and published by Professor Marsh 

 under the title " On the Dates of Professor Cope's Recent Publications." 



