O. Carteri, Leidy, loc. cit.

Washakius, Leidy. Cont. to. Ext. Vert. Faun., p. 123.

W. insignis, Leidy, loc. cit.

Passalacodon, Marsh. Am. Jour. of Sc., vol. iv. p. 208.

P. litoralis, Marsh, loc. cit.

Anisacodon,[1] Marsh. Am. Jour. of Sc., 3d Ser. vol. iv., p. 209.

[1] Professor Marsh has subsequently used this name to designate a genus of the Brontotheridæ. Am. Jour. of Sc., vol. ix., p. 246.

A. elegans, Marsh, loc. cit.

Centetodon, Marsh, Am. Jour. of Sc., 3d Ser. vol. iv., p. 209.