82 Bulletin American Museum of Natural History. [Vol. X, 



weathered, has been mounted in our skeleton. The second (No. 

 2963) was found upon level B, 40 feet higher; it exhibits the 

 form of the top and back of the skull, together with the complete 

 teeth and palate. Shortly afterwards, upon the same level A as 

 No. 2867, the skeleton (No. 2865) was discovered with fifteen ribs 

 and vertebrae, the humerus, ulna, radius and two or three of the 

 sternal bones. This was followed by the discovery on level A of 

 the hind limb (No. 2869), several pairs of jaws, and finally, upon 

 level B, the part of a crushed skeleton (No. 2829), including the 

 skull, jaws, all the ribs and vertebrae in position. This, as Dr. 

 Wortman wrote, made the party absolutely certain of a mount. 

 The four skulls, Nos. 2827, 2867, 2963, 2865, with the associated 

 skeletons, were thus found substantially upon the same geological 

 level, they are in the same stage of evolution, and are found to 

 belong to the classic species C. {Bathmodon) radians Cope, the 

 first known in America. 



The party then moved to the overlying Wind River Beds, and 

 discovered a unique skull (No. 2977) of a distinct species, which 

 reverses the natural order of evolution, since the sagittal crest is 

 a little broader than one's finger. This exhibits the desired tran- 

 sition between Pantola7nhda and Coryphodon, and represents, in all 

 probability, a persistent primitive type. 



Altogether parts of 18 individuals were found in the Wasatch 

 Beds (supplementing the 30 individuals found by Dr. Wortman in 

 1 891), and 7 individuals in the Wind River Beds. The selection 

 of nine individuals for mounting was done with great care as fol- 

 lows : The mounted skull. No. 2867, agrees exactly in size, and is 

 specifically identical with the skull and jaws of No. 5829. The lat- 

 ter (No. 2829), while laterally crushed, had associated with it the 

 right scapula and complete forelimb, left scapula and parts of left 

 limb which were used in mounting ; also all the vertebrae as far 

 back as the pelvis ; these vertebrae, while too much crushed to 

 mount, enabled us to determine the formula and select, from series 

 Nos. 2865 and 2863, vertebrae which exhibit the same characters. 

 The latter individual (No. 2863) included the pelvis and hind 

 limb, thus A^l^xmxmvi'g positively the correct proportions of the entire 

 animal. The mounting was done with great skill and care by Mr. 

 Hermann. 



