286 



FOSSIL VERTEBRATA OF NORTH AMERICA. 



[BUIJ,. 179. 



COCHLIODONTID.E. 



Owen, R. 1867 A. 



Brown, C. 1900 A, pp. 173, 174. 



Cope, E. D. 1891 N, p. 17. 



1898 B, p. 26. 

 Davis J. W. 1882 B. 



1883 A, pp. 331, 410. 



1890 B. 

 Koninck, L. G. de 1878 A, p. 29. 



Nicholson and Lydekker 1889 A, p. 939. 

 St. John and Worthen 1883 A, p. 201. 

 Traquair, R. H. 1888 A, p. 84. 

 Woodward, A. S. 1884 A, p. 269. 



1889 D, p. 169. 



1892 G. 

 Zittel, K. A. 1890 A, p. 68. 



HELODUS Agassiz. Type H. simplex Agassiz. 



Agassiz, L. 1843 B (1838), iii, p. 104. 



1844 A. 



Amer. Geologist 1888 A. 

 Davis, J. W. 1890 B. 

 Jaekel 0. 1898 A, p. 50. 

 Koninck, L. G. de 1844 A, p. 614. 



1878 A, p. 38. 

 McCoy, F. 1885, A, p. 630. 

 Miller, S. A. 1889 A, p. 599. 

 Newberry and Worthen 1866 A, p. 74. 



1870 A, p. 365. 



Nicholson and Lydekker 1889 A, p. 939. 

 Pictet, F. J. 1854 A, p. 266. 

 Quenstedt, F. A. 1885 A, p. 294. 

 St. John and Worthen 1875 A, p. 295. 

 Traquair, R. H. 1888 A, p. 84. 

 Trautschold, H. 1874 B, p. 288. 

 Ward, J. 1890 A, p. 143. 

 Woodward, A. S. 1884 A, p. 269. 



1889 D, pp. 171, 226. 



Woodward and Sherborn 1890 A, p. 92. 

 Zittel, K. A. 1890 A, p. 75. 



Helodus angulatus Newb. and Worth. 

 Newberry and Wortlien 1866 A, p. 83, pi. v, flgs. 



9-15. 



St. John and Worthen 1875 A, p. 362. 

 Woodward, A. S. 1889 D, p. 221. 



Subcarboniferous (Burlington); Illinois. 



Helodus biformis Newb. and Worth. 

 Newberry and Worthen 1866 A, p. 77, pi. iv, fig. 22. 

 St. John and Worthen 1875- A, p. 419. 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (Kinderhook): Iowa. 



Helodus carbonarius Newb. and 



Worth. 

 Newberry aud Worthen 1866 A, p. 75, pi. iv, figs. 20, 



20a. 



Woodward, A. S. 1889 D, p. 226. 

 Coal-measures: Illinois. 



Helodus coniculus Newb. and Worth. 

 Newberry and Worthen 1866 A, p. 75, pi. iv, flgs. 



19, 19a. 



Kindle, E. M. 1898 A, p. 484. 

 Newberry, J. S. 1879 A, p. 344. 

 Wordward, A. S. 1889 D, p. 226. 



Subcarboniferous (Keokuk); Illinois: (St. 



Louis); Indiana: (Burlington); Iowa. 



Helodus consolidatus Newb. and 



Worth. 

 Newberry and Worthen 1866 A, p. 87, pi. vi, flgs. 



Hambach, G. 1890 A, p. 81. 

 Woodward A. S. 1889 D, p. 226. 



Subcarboniferous (Keokuk); Illinois, Mis- 

 souri. 



Helodus crenulatus Newb. and Worth. 

 Newberry and Wortlien 1866 A, p. 82, pi. v, flgs. 7, 7o. 

 Hambach, G. 1890 A, p. 81. 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (Keokuk); Illinois, Mis- 

 souri (fide Hambach). 



Helodus dens-humani Newb. and 



Worth. 

 Newberry and Worthen 1866 A, p. 76, pi. iv, flgs. 



21-216. 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (Keokuk); Illinois. 



Helodus denticulatus Newb. and 

 Worth. 



Newberry and WorthenlS66 A, p. 81, pi. v, flgs. 6-66. 

 St. John and Worthen 1875 A, p. 317. (Helodus?) 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (Keokuk); Illinois. 



Helodus elytra Newb. and Worth. 

 Newberry and Worthen 1866 A, p. 78, pi. iv, fig. 23. 

 St. John and Worthen 1875 A, p. 299. (Choma- 

 todus.) 



1883 A, p. 95. (Helodus.) 

 Subcarboniferous (Keokuk); Illinois. 



Helodus gibberulus Agassiz. 



Agassiz, L. 1843 B (1838), iii, p. 106, pi. xii, flgs. 1, 2. 



Davis, J. W. 1883 A, p. 405, pi. li, fig. 19. (Lopho- 

 dus.) 



Newberry, J. S. 1889 A. p. 102. 



Trautschold, H. 1874 A, p. 269, pi. xxvi, fig. 9. 



Woodward, A. S. 1889 D, p. 219. 



Carboniferous; Europe: Subcarboniferous 

 (Waverly): Pennsylvania: ("Mountain lime- 

 stone"); Illinois, Indiana. 



Helodus gibbus Leidy. 



Leidy, J. 1857 H, p. 88, pi. v, fig. 18. 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (Warsaw); Illinois. 



Helodus laevis Newb. 



Newberry, J. K. 1879 A, p. 343. 

 Kindle, E. M. 1898 A, p. 484. 

 Woodward, A. S. 1889 D, p. 226. 



Subcarboniferous (St. Louis); Indiana. 



