_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. AVES. RAPTORES. Bubo. _B. leptosteus_, Marsh. Am. Jour. of Sc., 3d Ser. vol. ii, p. 126. GRALLATORES. Aletornis, Marsh. Am. Jour. of Sc., 3d Ser. vol. iv., p. 256. _A. nobilis_, Marsh, loc. cit. _A. pernix_, Marsh, loc. cit. _A. venustus_, Marsh, loc. cit., p. 257. _A. gracilis_, Marsh, loc. cit., p. 258. _A. bellus_, Marsh, loc. cit. SCANSORES. Uintornis, Marsh. Am. Jour. of Sc., 3d Ser. vol. iv., p. 259. _U. lucaris_, Marsh, loc. cit. REPTILIA. CROCODILIA. 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. _C. Elliotii_, Leidy, loc cit. Diplocynodus. _D. subulatus_, Cope. U. S. Geol. Survey, 1872, p. 613; _Crocodilus subulatus_, Pr. Am. Phil. Soc., 1872, p. 554. _D. polyodon_, Cope. U. S. Geol. Survey, 1872, p. 614. (In his report to Lt. Wheeler, Prof. Cope says that "a single species, the _D. subulatus_, occurs" in the Bridger Basin, (p. 60). It is therefore probable that he has changed the _D. polyodon_, but we cannot find its synonym.) LACERTILIA. Saniva, Leidy. Pr. Ac. Nat. Sc., 1870, p. 124; U. S. Survey, 1870, p. 368; do., 1871, p. 370; Com. to Ext. Vert. Faun., p. 181. _S. ensidens_, Leidy, loc. cit. _S. major_, Leidy. Cont. to Ext. Vert. Faun., p. 182. Chameleo. _C. pristinus_, Leidy. Pr. Ac. Nat. Sc., 1872, p. 277; Cont. to Ext. Vert. Faun., p. 184. Naocephalus, Cope. Pr. Am. Phil. Soc., 1872, p. 465; U. S. Geol. Survey, 1872, p. 631. _N. porrectus_, Cope, loc. cit.; U. S. Geol. Survey, 1872, p. 632. Glyptosaurus, Marsh. Pr. Ac. Nat. Sc., 1871, p. 105; Am. Jour. of Sc., 3d Ser. vol. i., p. 456. _G. sylvestris_, Marsh, loc. cit. _G. nodosus_, Marsh, Am. Jour. of Sc., vol. i., p. 458. _G. ocellatus_, Marsh, loc. cit., vol. i., p. 458, and vol. iv., p. 306. _G. anceps_, Marsh, loc. cit., vol. i., p. 458. _G. princeps_, Marsh, loc. cit., 3d Ser. vol. iv., p. 302. _G. brevidens_, Marsh, loc. cit., p. 305. _G. rugosus_, Marsh, loc. cit. _G. sphenodon_, Marsh, loc. cit., p. 306. Thinosaurus, Marsh. Am. Jour. of Sc., 3 Ser. vol. iv., p. 299. _T. paucidens_, Marsh, loc. cit. _T. leptodus_, Marsh, loc. cit., p. 300.