2 



is present fore and aft, it is wanting internally and externally. The 

 anterior median tubercle is present on all the true molars, and the bases of 

 the acute inner cones are in contact. The sagittal crest is truncate, and 

 the squamosal portion of the zygoma very stout. The nasal bones are 

 together very convex in transverse section. 



M. 



Length of true molar series (2.75 in. ) 0. 067 



" last " 025 



Width " " 026 



Length of penultimate molar 026 



" " " .026 



Depth of squamosal process 025 



Found by the writer on a bluff on Green River, near the mouth of the 

 Big Sandy, Wyoming. 



The papers descriptive of fossils from the Wyoming basin published by 

 the writer during the year 1872, were issued at the following dates : 



On Bathmodon, an extinct genus of Ungulates, February 16th. 



On a new genus of Pleurodira from the Eocene of Wyoming, July 11th. 



On the Tertiary coals and fossils of Osino, Nevada, July 29th. 



Descriptions of some new Vertebrata from the Bridger Group of the 

 Eocene, July 29th. 



Second account of new Vertebrata from the Bridger Eocene, August 3d. 



Third account of new Vertebrata from the Eocene of Wyoming Terri- 

 tory, August 7th. 



On the existence of Binosauria in the Transition beds of Wyoming, 

 near August 12th. 



Notice of Proboscidians from the Eocene of Southern Wyoming, 

 August 19th. 



Notices of new Vertebrata from the upper waters of Bitter Creek, Wy- 

 oming Territory, August 20th. 



Second notice of Extinct Vertebrates from Bitter Creek, Wyoming, 

 August 22d. 



On the Dentition of Metalophodon, September 20th. 



On a new Vertebrate genus from the northern part of the Tertiary 

 Basin of Green River, October 12th. 



Descriptions of new Extinct Reptiles from the Upper Green River 

 Eocene Basin, Wyoming, October 12th. 



I have just received a paper "On the Gigantic Fossil Mammals of the 

 Order Dinocerata, by Prof. O. C. Marsh," wnich contains a formidable 

 catalogue of errors which the author appears to suppose I have com- 

 mitted in describing animals of this type. All this is explained by the 

 fact that Prof. Marsh has never seen the genus Eobasileus, Cope, and er- 

 roneously supposes it to resemble Uintatlierium, Leidy (Binoceras, 

 Marsh). The descriptions which I have given are correct, as will pres- 

 ently appear, as well as the fact that I have anticipated the Professor in 

 the descriptions of some of the allied species. 



Issued January 31st, 1873. 



