62 Trans. Acad. JSci. of St. Louis. 



1895. Archaeocidaris wortheni. Keyes, Proc. Iowa Acad. 

 Sci., vol. 2, p. 187, pi. 20, figs. 3 a, b. 



1896. Archaeocidaris wortheni. Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p, 214, pi. 8, figs. 43-46. 



1897. Archaeocidaris Wortheni. Tornquist, Abhdl. Geol. 

 Karte Elsass-Lothr., Bd. 5, hft. 6, p. 770, taf. 21, 

 fig. 5. 



Primary tubercle papilliform, moderately elevated above 

 the annulation. Annulation thickened and spreading into a 

 slightly elevated disc. Margin denticulated. 



Primary spines slender, elongate, slightly curved, smooth 

 or finely granulated . Articulating end expanded into a crenu- 

 lated annulation and then contracted abruptly below. 



Geological formation and locality : St. Louis Limestone, 

 near St. Louis, Mo. ; Eureka District, Nevada. 



UNDETERMINED OR INSUFFICIENTLY DETERMINED SPECIES. 



1. Archaeocidaris glabrispina Philipps. 



1836. Oidaris glabrispina. Philipps, Geol. Yorkshire, vol. 



2, p. 208. 

 1844. Echinocrinus glabrispina. M'Coy, Foss. of Ireland, 



p. 173. 

 1862. Archaeocidaris glabrispina. Dujardin et Hup^, Echi- 



nodermes, p. 466. 

 1874. Archaeocidaris glabrispina. Loven, Kongl. Svens. 



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

 Geological formation and locality: Subcarboniferous, 

 Ireland. 



2. Archaeocidaris grIjneri Julien. 



1896. Archaeocidaris gruneri. Julien, Terr. Garb. Marin de 

 la France Centrale, p. 125, pi. 16, figs. 11, 12. 

 Geological formation and locality: Carboniferous, TAr- 

 doisi^re, France. 



