Triacodon, Marsh. Am. Jour. of Sc., 3d Ser. vol. ii., p. 123.
_T. fallax_, Marsh, loc. cit.
_T. grandis_, Marsh, loc. cit. 3d Ser. vol. iv., p. 222.
_T. nanus_, Marsh, loc. cit., p. 223.
_T. aculeatus_, Cope. Pr. Phil. Soc., 1872, p. 460; U. S. Geol. of
Terrs., 1872, p. 611.
_Genera incertæ sedis._
Stenacodon, Marsh. Am. Jour. of Sc., 3d Ser. vol. iv., p. 210.
_S. rarus_, Marsh, loc. cit.