THE NATURAL HISTORY SURVEY. 193 



1901. Ceraurus niagarensis. van Ing., School of Mines Quart., 

 vol. 23, p. 35 (no description). 



Silurian: St. Clair Spring, Independence Co., Ark. 

 1904. Ceraurus ' (Crotalocephalus} niagarensis. Kindle, 28th Ann. 

 Rep. Dep. Geol. and Nat. Res., Indiana, p. 483, pi. 23, 

 figs. 1-2, pi. 24, fig. 8. 



Niagara: Connor's Mill, Marion and Georgetown, Ind. 

 [ 1907. Ceraurus niagarensis. Weller, This Bulletin, p. 263, pi. 24, 

 figs. 20-21. 



Niagaran: Hawthorn and near Lemont, 111. 



CORYDOCEPHALUS Corda, 1847. 

 Corydocephalus byrnesanus (M. & G.) 



1893. Lichas byrnesanus. M. & G., Bull. No. 3, 111. St. Mus. Nat. 

 Hist., p. 78, pi. 8, figs. 8-9. 



Niagara: Near Madison, Ind. 

 Corydocephalus depauperatus (van Ing.). 



1901. Arges phlyctenoides depauperatus. van Ing., School of Mines 

 Quart., vol. 23, p. 57. 



Silurian: St. Clair Spring, Independence Co., Ark. 

 Corydocephalus phlyctainodes (Green). 



1837. Calymene phlyctainodes. Green, Am. Jour. Sci., 1st ser., 

 vol. 32, p. 167. 



Springfield, Ohio. 



1852. Arges phlyctanoides. Hall, Pal. N. Y., vol. 2, p. 314, pi. 70, 

 figs. 2a-2c. 



Niagara: Albion, N. Y. 



1893. Lichas hanoverensis. M. & G., Bull. No. 3; 111. St.. Mus. 

 Nat. Hist., p. 78, pi. 8, figs. 6-7. 



Niagara: Hanover, Ind. 



1907. Corydocephalus phlyctainodes. Weller, This Bulletin, p. 234, 

 pi. 22, figs. 1-4. 



Niagaran: Joliet and near Lemont, 111. 

 Corydocephalus ptyonurus H. & C. 



1888. Lichas (Dicranogmus} ptyonurus. H. & C., Pal. N. Y., vol. 

 7, p. 86, pi. 19B, figs. 19-21. 



Coralline limestone: Schoharie, N. Y. 



CRYPTONYMUS Eichw., 1825. 



Cryptonymus ornatus Vogdes, see Encrinurus ornatus H. & W. 

 Cryptonymus nereus Vogdes, see Encrinurus nereus Hall. 



CYBELE Loven, 1845. 

 Cybele punctata Hall, see Encrinurus ornatus H. & W. 



CYPHASPIS Burm., 1843. 

 Cyphaspis arkansanus van Ing. 



1901. Cyphaspis arkansanus. van Ing., School of Mines Quart., 

 vol. 23, p. 35 (no description). 



Silurian: St. Clair Spring, Independence Co., Ark. 

 Cyphaspis christyi Hall. 



1864. Cyphaspis christyi. Hall, Trans. Albany Inst., v61. 4, p. 220. 

 Niagara: Waldron, Ind. 



