74 Trans. Acad. Sci. of St. Louis. 



1892. Echinodiscus sampsoni. Miller, 17th Rep. Geol. Surv. 



Ind., p. 686, pi. 12, lig. 16. 

 1894. Echi7}odiscus sampsoni. Keyes, Mo. Geol. Surv., vol. 



4, p. 133. 

 Geological formation and locality: Keokuk Limestone, 

 Boonville, Mo. 



c. EoTiARis Lambert 1900.* 



d. KoNiNCKOCiDARis Dollo and Buisseret 1888. f 



e. Leptechinus Tornquist 1897. J 



1. Leptechinus gracilis Tornquist. 



1897. Leptechinus gracilis. Tornquist, Abhdl. Geol. Karte 

 Elsass-Lothr., bd. 5, heft 6, p. 785, taf . 20, fig. 5. 

 Geological formation and locality: Carboniferous, Huns- 

 riickenwald, Germany. 



f. Myriastiches Sollas 1899. § 



1. Myriastiches gigas Sollas. 



1899. Myriastiches gigas. Sollas, Quart. Journ. Geol. Soc. 

 Lond., vol. 55, pt. 4, p. 700, fig. 5. 

 Geological formation and locality: Lower Ludlow Lime- 

 stone, England. 



g. Permocidaris Lambert 1900. || 



h. Proterocidaris De Koninck 1881.11 



1. Proterocidaris GiGANTEUS De Koninck. 



1881. Proterocidaris giganteus. De Koninck, Compt. Rend, 

 de r Assoc. Fran§. pour I'Avance. des Sci. lOe Sess., 

 p. 514, pi. 8. 



* Bull. Soc. Yonne, t. 53, 1 er Sem., pt. 2, p. 40. 

 t Compt. Rend. Acad. Sci. Paris, 1. 106, no. 13. 

 X Abhdl. Geol. Karte Elsass-Lothr., bd. 6, heft 6, p. 785. 

 § Quart. Journ. Geol. Soc. Lond., vol. 65, pt. 4, p. 700. 

 II Bull. Soc. Yonne, t. 53, ler sem., pt. 2, p. 39, 47. 

 t Assoc. Franc, pour I'Avance. des Sci. Compt. Renl. de la lOe Seas., 

 Alger 1881, p. 614. 



