192 THE CHICAGO ACADEMY OF SCIENCES. 



CERAURUS Green, 1832. 



Ceraurus bimucronatus Roemer, see Ceraurus niagarensis Hall. 

 Ceraurus clintoni Foerste. 



1887. Ceraurus . Foerste, Bull. Sci. Lab. Den. Univ., vol. 2, 



p. 98, pi. 8, fig. 17. 



Clinton: Near Dayton, Ohio. 



1895. Ceraurus (Pseudosphaerexochus} clintoni. Foerste, GeoL 

 Surv., Ohio, vol. 7, p. 527, pi. 27, fig. 17. 



Clinton : Ohio. 

 Ceraurus hydei Weller. 



1907. Ceraurus hydei. Weller, This Bulletin, p. 264, pi. 24, fig. 22. 



Niagaran: Near Lemont, 111. 



Ceraurus insignis Hall, see Ceraurus niagarensis Hall. 

 Ceraurus niagarensis Hall. 



1852. Ceraurus insignis. Hall, Pal. N. Y., vol. 2, p. 300, pi. A66, 

 fig. 4; also p. 303, pi. 67, figs. 9-10. (not C. insigins Beyr.) 

 Clinton: New York. 

 Niagara: Rochester, N. Y. 



1860. Ceraurus bimucronatus. Roemer, Sil. Faun. West. Tenn., p. 

 80, pi. 5, fig. 19. (not C. bimucronatus Murch.) 



Silurian: Decatur County, Tenn. 



1862. Ceraurus insignis. Hall, Geol. Surv. Wis., vol. 1, p. 433 

 (no description). 



Niagara : Wisconsin. 



1865. Ceraurus insignis. Hall, Adv. Sheets, 18th Rep. N. Y. St. 

 Cab. Nat. Hist., p. 31. 



Niagara: Wauwatosa, etc., Wis. 



1867. Ceraurus insignis. Hall, 20th Rep. N. Y. St. Cab. Nat. Hist., 

 p. 335. 



Niagara: Wauwatosa, Wis. 



1867. Ceraurus niagarensis. Hall, 20th Rep. N. Y. St. Cab. Nat, 

 Hist., p. 376, pi. 21, figs. 10-11. 



Niagara: Wisconsin. 



1870. Ceraurus niagarensis. Hall, 20th Rep. N. Y. St. Cab. Nat. 

 Hist. (rev. ed.), p. 427, pi. 21, figs. 10-11. 



Niagara : New York and Wisconsin. 



1877. Sphaerexochus romingeri ? Hall, 25th Rep. N. Y. St. Mus. 

 Nat. Hist. (doc. ed.), pi. 32, fig. 16. . 



Niagara: Waldron, Ind. 



1879. Ceraurus (Cheirurus) niagarensis. IJall, 28th Rep. N. Y. 

 St. Mus. Nat. Hist. (mus. ed.), p. 189, pi. 32, fig. 16. 



Niagara: Waldron, Ind. 



1882. Ceraurus niagarensis. Hall, llth Rep. Dep. Geol. and Nat. 

 Hist., Indiana, p. 335, pi. 34, fig. 16, pi. 33, fig. 10. 



Niagara: Waldron, Ind. 



1884. Ceraurus niagarensis. Whiteaves, Geol. Surv. Canada; 

 Pal. Foss., vol. 3, pt. 1, p. 42. 



Guelph: Hespeler, Ont. 



1895. Ceraurus niagarensis. Whiteaves, Geol. Surv. Canada;. 

 Pal. Foss., vol. 3, pt. 2, p. 107. 

 Guelph: Hespeler, Ont. 



