68 Trans. Acad. Sci. of St. Louis. 



3. Eocidaris hallianus Geinitz. 



1866. Eocidaris Hallianus. Geinitz, Carb. u. Dyas in Neb., 



p. 61, tab. 5, figs. 1 a, b, 2 a, b. 

 1872. Eocidaris Hallianus. Meek, U. S. Geol. Surv. Neb., 



p. 152, pi. 7, figs. 9 a-d. 

 1889. Eocidaris Hallanus. Miller, N. Amer. Geol. Pal., p. 



242. 



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

 vol. 4, p. 129. 



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

 Sci., vol. 2, p. 190. 



1903. Eocidaris halliana? Girty, U. S. Geol. Surv. Pro- 

 fessional Paper No. 16, p. 332. 



Around the primary tubercle is an irregular ring of per- 

 forated nodules, some of which are surrounded by small 

 granules. 



Primary spines have a prominent ring near the base. 

 Spines finely striated and curved near the apex. Small 

 spinules, projecting from the spines. 



Geological formation and locality : Upper Coal Measures, 

 Nebraska City. Neb.; Kansas City, Mo.; Leadville and 

 Crested Butte district, Colo. 



4. Eocidaris keyserlingi Geinitz. 



1848. Cidaris Keyserlingi. Geinitz, Verstein. des Zech- 

 stein Gebirges, I, p. 16, pi. 7, figs. 1, 2. 



1858 Eocidaris Kaiserlingii. Desor, Syn., p. 155, tab. 21, 

 figs. 15, 16. 



1861. Eocidaris Keyserlingi. Geinitz, Anim. Uebereste der 

 Dyas, I, p. 108, pi. 20, figs. 5-9. 



1862. Eocidaris Kaiserlingii. Dujardin et Hupe, Echino- 

 dermes, p. 467. 



1874. Eocidaris Keyserlingi. Loven, Kongl. Svens. Vetens. 



Akad. Handl., bd. 11, no. 7, p. 42. 

 1887. Eocidaris Keyserlingi. Kolesch, Jena. Zeitschr. f. 



Naturwiss., bd. 20, p. 5, taf. 38, figs. 4-19. 



