Eohttsileus. Oojn' :* Pr. Am. riiil. Soc. 1872, 4.S5, pxiblisbed in advance August 

 L'O, 1872; ibid. 1872, 512; ihiil. 1873, published as a separate pamphlet, "On 

 the Short-Footed Ungulata of the Eocene of Wyoming," March 11, 1873 ; Pr. 

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



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

 August 22, 1872. Here regarded as the same genus tirst named in the Pro- 

 ceedings of February 16, 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. 1873, 

 102. 



LcfalopUodon. Typograpliical error? Cope: Pr. Am. Phil. Soc. 1872, 515. 



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



27, 1872; iUd. 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, 3GG. 



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

 Wyomiug," 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 wuler tlie 

 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 

 difterent fossils upon which the genera were founded, except those 

 described by myself under the name of Ulntatherium 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 inirabilis. 



As far as I am al)lc 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 ns 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 jiublications 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." 



