538 



FOSSIL VERTEBRATA OF NORTH AMERICA. 



[BULL. 179. 



ICHNITES. 



The imprints of the feet of animals on the rocks have been described under various general names, 

 such as Ichnites, OrnithUes, Ornichichnites, Ornithoidichnites, Sauroidichnites, Batrachoidichnites. The 

 first attempt to place under generic names the various .forms found in North America was made by 

 President Edward Hitchcock in 1845 ( Hitchcock, E. 1845 B) . This communication the present writer has 

 made the basis for both the generic and the specific names. Many of the names, both generic and spe- 

 cific, were afterwards changed; but this was done in violation of the rules of nomenclature as now 

 recognized. On account of the impossibility of determining with certainty the systematic positions 

 of the animals which made the tracks described, the " genera " are arranged alphabetically. 



Bouve, T. T. 1859 B. 

 Cope, E. D. 1867 D. 

 Deane, J. 1844 A. 

 1844 B. 



1844 C. 



1845 A. 

 1845 B. 

 1845 C. 

 18451). 



Edwards, A. Milne 1869 A. 

 Field, R. 1860 A. 



1860 C. 



Giebel, C. G. 1847 B, p. 34. 

 Hitchcock, C. H. 1855 A. 



1871 A. 

 1889 A. 



Hitchcock, E. 1836 A. 

 1837 A. 



1841 A. 



1843 A. 



1844 A. 



Hitchcock, E. 1844 B. 

 1845 A. 



1845 B. 



1847 A. 



1848 A. 

 1858 A. 

 1861 A. 

 1863 A. 

 1865 A. 



Lyell, C. 1842 A. 

 1843 A. 



1846 B. 



Marsh, D. 1848 A. 

 Mitchell, J. 1895 A. 

 Mudge, B. F. 1866 A. 



1874 A. 



Pictet, F. J. 1853 A, p. 406. 

 Quenstedt, F. A. 1852 A, p. 

 Rogers, H. D. 1842 A. 

 Sickler, F. K. L. 1835 A. 

 Silliman, B. 1837 A. 

 Snow, F. H. 1887 A. 

 Voigt, F. S. 1835 A. 

 Zittel, K. A. 1890 A, p. 411. 



ALLOPUS Marsh. Type A. littoralis Marsh. 



Marsh, 0. C. 1894 D, p. 83. 



All opus littoralis Marsh. 



Marsh, O. C. 1894 D, p. 83. 



Miller, S. A. 1897 A, p. 793: 

 Coal-measures; Kansas. 



1894I.pl. xi, figs. 4, 4a. 



AMBLYPUS E. Hitch. Type A. dextratus E. Hitch. 



Hitchcock, C. H. 1889 B, p. 119. 

 Triassic; Massachusetts. 



Hitchcock, E. 1858 A, p. 143. 



Amblypus dextratus E. Hitch. 



Hitchcock, E. 1858 A, p. 143, pi. xxv, fig. 7; pi. 

 xlviii, fig. 5. 



ANCYROPUS E. Hitch. Type Sauroidichnites heteroclitm E. Hitch. 



Hitchcock, E. 1845 B, p. 24. 

 1848 A, p. 242. 

 1858 A, p. 138. 



Ancyropus heteroclitus E. Hitch. 

 Hitchcock E. 1845 B, p. 24 (A. heteroclitus, A. jack- 



sonianus.) 

 Hitchcock, C. H. 1889 B, p. 119. 



Hitchcock, E. 1841 A, p. 479, pi. xxx, fig. 2 (Saur- 

 oidichnites heteroclitus); fig. 3 (Saur. jack- 

 sonii). 



1848 A, p. 243, pi. xv, figs. 3-5. 



1858 A, p. 139, pi. xxv, figs. 3, 4; pi. liii, figs. 



1,2. 

 Triassic; Connecticut. 



