Douglass: New Merycoidodonts. -'9 



VI. SOME NEW MERYCOIDODONTS. 



By Earl Douglass. 

 During the various expeditions of the Carnegie Museum in Mon- 

 tana and North Dakota many remains of Merycoidodonts have been 

 obtained from various localities and geological horizons. Much of 

 this material was supposed to be new to science, but it was not until 

 the types and other specimens in the museums at Washington, Prince- 

 ton, New York, and New Haven were examined, and the collections 

 in the Carnegie Museum were cleared from the matrix and made 

 accessible for study and comparison, that the new species could be 

 intelligently described. The collection has been placed in the hands 

 of the present writer by the Director of the Museum, Dr. Wm. J. 

 Holland, with the request that preliminary accounts of the new mater- 

 ial be given, pending the preparation of a more complete memoir. 



The following species are based, it is believed, on sufficiently com- 

 plete material. Other remains which are interesting and are undoubt- 

 edly new, but not complete enough to be satisfactorily treated as types, 

 will be described in a later paper. 



Eucrotaphus dickinsonensis sp. nov. 

 (Plate XXII.) 

 (Type No. 1584, Carnegie Museum Catalogue of Vertebrate Fossils.) 

 The type, which was collected by Earl Douglass in 1905, consists 

 of a nearly complete skull and mandible with the greater portion of 

 the spinal column, and fragments of limb and foot bones. The 

 specimen was found near the top of the thick nodular beds of the 

 Middle White River (" Oreodon ") horizon of the Little Bad Lands 

 near Dickinson in North Dakota. Though not suspected at the time 

 when the specimen was collected, it is barely possible that it may 

 have come from the upper beds which contain remains of Eucro- 

 taphus major (.?)• The remains were not imbedded in their original 

 position and they may have been derived from a higher level, though 

 the specimen is quite different from any species of Eucrotaphus so far 

 found in the upper beds. It is also different from the one specimen 

 of Eucrotaphus bullatus ? which was found in the upper portion of the 

 11 Oreodon" Beds. 



The size is about the same as that of Merycoidodon culbertsoni. The 

 upper antero-posterior line of the skull is convex, the brain-case well 



