56 Trans. Acad. Set. of St. Louis. 



1879. Archaeocidaris rossica. Trautschold, Nouv. Mem. 



Soc. Imp. Nat. Moscou, t. 14, liv. 1, p. 5, tab. 2, figs. 



1 a-e. 

 1896. Archaeocidaris rossica. Tornquist. Neu. Jabrb. Miner. 



Geol. u. Pal., bd. 2, p. 27, taf. 4, figs. 1-8. 

 1900. Archaeocidaris rossica. Hesse, Neu. Jabrb. Miner. 



Geol. u. Pal., beil.-bd. 13, p. 213. 

 Scrobicule large, embracing nearly tbe wbole plate. Edges 

 ornamented witb small granules. Spines large witb smooth 

 rino; and covered with fine ajranules not arranged in series. 



Geological formation and locality : Subcarboniferous : Pas- 

 kra, Staritza, Ivanof, Utega, Kopocheva, Kosimol, Mjatch- 

 kova Podolesk, Russia. 



19. Archaeocidaris shumardanus Hall. 



1858. Archaeocidaris shumardana . Hall, Geol. Iowa, vol. 1, 

 pt. 2, p. 699, pi. 26, figs. 3a-d. 



1867. Archaeocidaris Shumardana. Dana, Man. Geol., 

 p. 312, fig. 534. 



1874. Archaeocidaris sJiumardana. Loven, Kongl. Svens. 

 Vetens. Akad. Handl. bd. 11, no. 7, p. 43. 



1884. Archaeocidaris cf. Shumardana. Walcott, Pal. Eu- 

 reka Dist., p. 212. 



1889. Archaeocidaris shumardana. Miller, N. Amer. Geol. 

 Pal., p. 225. 



1894. Archaeocidaris shumardana. Keyes, Mo. Geol. Surv., 

 vol. 4, p. 128. 



1895. Archaeocidaris shumardiana. Keyes, Proc. Iowa 

 Acad. Sci., vol. 2, p. 186. 



Primary tubercles papilliform with a deep space between 

 the tubercle and the annulation. Annulation has an abrupt 

 upper margin, swelling out below into a convex rim. Surface 

 between this rim and the elevated nodose margin is abruptly 

 concave. Primary spines short, smooth or finely striated 

 near the base, otherwise muricate with ascending nodes. 



Geological formation and locality: Warsaw Limestone, 

 Warsaw, 111. ; Lower Carboniferous, Eureka District, Nevada ; 

 Keokuk Limestone, La Grange, Mo. 



