Crocodilus.

C. liodon, Marsh. Am. Jour. of Sc., 3d Ser. vol. i., p. 454.

C. affinis, Marsh, loc. cit.

C. Grinnelli, Marsh, loc. cit., p. 455.

C. brevicollis, Marsh, loc. cit., p. 456.

C. parvus, sp. nov. This report, p. 91.

C. clavis, Cope. Pr. Am. Phil. Soc., 1872, p. 485; U. S. Geol. Survey, 1872, p. 612.

C. sulciferus, Cope. Pr. Am. Phil. Soc., 1872, p. 555; U. S. Survey, loc. cit.

C. hetorodon, Cope. Alligator heterodon, Pr Am. Phil. Soc., 1872, p. 544; U. S. Geol. Survey, 1872, p. 614.

C. aptus, Leidy. Cont. to Ext. Vert. Faun., p. 126.