1S98.] MINUTES. 81 



The differences between Protoreodon and Agriotherium are such 

 as strongly to suggest the inference that, while the former is the 

 ancestor of the Oreodonts, the latter stands in a similar relation to 

 the Agriochcerids. This determination can, at present, be only 

 provisional, until more is learned concerning the foot-structure of 

 the present genus. At all events, if Agriotherium be not the 

 desired ancestral form, we may feel confident that that form, 

 when found, will prove to be of a very similar character. 



Hyomeryx Marsh. 



Amer. Journ. Sci., third series. Vol. xlviii, p. 268. 



This genus, which is described as having no upper incisors, I 

 have not seen. It differs from the two preceding genera not only 

 in the loss of the upper incisors, but also in the form of the upper 

 molars, which have far less concave external crescents, and less 

 prominent outer buttresses. 



The study of the Uinta Selenodonts lends much strength to the 

 opinion expressed by various writers, that the Oreodonts are related 

 to the Tylopoda. It now appears likely that this family leads back 

 either to Homacodon of the Bridger, or to some nearly allied form 

 of the same family. If this be true, we shall then have the more 

 extended generalization, that all of the indigenous North American 

 Selenodonts belonged to the Tylopoda and that this suborder has 

 had a much more extended and varied development than we have 

 hitherto supposed. While this conclusion is already extremely 

 probable for the other families, we have yet to find the direct fore- 

 runners of Protoreodon and Agriotherium before it can be estab- 

 lished for the Oreodonts and Agriochcerids. 



Stated Meeting^ April i, 1898. 



* Mr. Fredekick Prime in the Chair. 



Present, 12 members. 



Correspondence Avas submitted and donations reported. 

 Dr. Morris, on behalf of the Curators, exhibited a fac- 

 simile of the Declaration of Independence in the handwriting 



PROG. AMER. PHILOS. SOC. XXXVII. 157. F. PRINTED JUNE 7, 1898. 



