62 Trans. Acad. Sci. 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. Annulatiou thickened and spreading iuto a 

 slightly elevated disc. Margin denticulated. 



Primary spines slender, elongate, slightly curved, smooth 

 or finelv 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 OK INSUFFICIENTLY DETERMINED SPECIES. 



1. Archaeocidaris glabrispina Philipps. 



1836. (Jidaris glabrispina. Philipps, Geol. Yorkshire, vol. 



2, p. 208. 

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



p. 173. 

 1862. Archaeocidaris glabrispina. Dujardin et Hupe, 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 gruneri Julien. 



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

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

 Geological formation and locality : Carboniferous, l'Ar- 

 doisiere, France. 



