E. L. Troxell — American Bothriodonts. 335 



earlier age than the genera from the Protoceras beds 

 {Elomeryx, Octacodon, Heptacodon). ^pinacodon rost- 



FiG. 5. — Elomeryx armaius angustus, subsp. nov. Holotype. Cat. No. 

 10393, Y. P. M. Palatal view of skull. X 1/3- 



ratus (Scott) comes from the Metamynodon sandstones 

 (lower Oreodon beds) ;^^ A. deflectus (Marsh) from the 



^^ Hyopotamus americanus, referred specimen, is also from the Metamyno- 

 don stratum. See Osborn and Wortman, op. cit., p. 220. 



