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



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



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

 1894. Echinodiscus saynpsoni. Keyes,Mo. Geol. Surv., vol. 



4, p. 133. 

 Geological formation and locality : Keokuk Limestone, 

 Boonville, Mo. 



c. EoTiARis Lambert 1900.* 



d. KoNiNCKOciDAEis Dollo and Buisseret 1888. t 



e. Leptechinus Tornquist 189 7. t 



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. If 



1. Proterocidaris giganteus De Koninck. 



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

 de r Assoc. Franc, 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, t. 106, no. 13. 

 t Abhdl. Geol. Karte Elsass-Lothr., bd. 5, 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. 



1 Assoc. Franc, pour I'Avance. des Sci. Compt. Eend. de la lOe Seas., 

 Alger 1881, p. 514. 



