THE 



AMERICAN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Art. XXII. — A Newly Mounted Eporeodon; by Malcolm 

 EuTHERFORD Thorpe. With Plate I. 



[Contributions from the Othniel Charles Marsh Publication Fund, Pea- 

 body Museum, Yale University, New Haven, Connecticut.] 



In the Marsh Collection are two nearly complete skele- 

 tons of Eporeodon socialis, one of which has been recently 

 restored and mounted. The two specimens are cotypes, 

 designated by Cat. Nos. 13118 and 13119, Y. P. M., and 

 were collected at Scott's Blnff, Nebraska, by M. H. Clif- 

 ford and A. S. Shelley on August 17, 1874. The skeletons 

 were found very close together, in fact the skull of one 

 was about 3 inches from that of the other and their verte- 

 bral columns were parallel. No. 13119 is now mounted 

 (fig. 1). No. 13118 is a little smaller and of somewhat 

 more slender proportions than the other skeleton. Both 

 animals were fully adult, and while the detection of sex 

 differentiation is extremely difficult if not impossible in 

 this genus, yet it is not unreasonable to suppose that the 

 larger (mounted) skeleton may have been a male and the 

 other a female. 



The bones, now freed from matrix, are of Upper Oligo- 

 cene (Protoceras beds) age. The preparation and mount- 

 ing were done by Mr. Hugh Gibb under the supervision 

 of the author. After erecting the skeleton, the muscles 

 of the right side of the body, head, and limbs were then 

 modeled by Professor R. S. Lull over the actual bones. 

 Viewed from the left (fig. 1), practically the entire skele- 

 ton is visible, while the right aspect (fig. 2) shows the 

 complete animal in the flesh. Nearly all of the bones are 

 removable and readily lend themselves to detailed study. 



The osteology of this species has been worked out in 

 detail and drawings made of the skull and various bones, 

 for future publication. 



Am. Jour. Sci. — Fifth Series, Vol. IT, No. 12. — December, 1931. 



