62 Trans. Acad. Sci. of St. Louis. 



Headwaters of the Verdigris River and in the valley of the 

 Cottonwood Creek, Kansas; Independence, Mo. 



13. Archaeocidaris mucronatus Meek and Worthen. 



1860. Archaeocidaris mucronata. Meek and Worthen, Proc. 



Acad. Nat. Sci. Phil., p. 395. 

 1866. Archaeocidaris mucronata. Meek and Worthen, Geol. 



Surv. 111., vol. 2, p. 295, pi. 23, figs. 3 a-c. 

 1874. Archaeocidaris mucronata. Loven, Kongl. Svens, 



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

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



Pal., p. 225. 

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



Sci., vol. 2, p. 188. 

 Central tubercle prominent with a distinct annular groove. 

 Primary spines long and tapering with a slight curvature 

 above the articulating extremity. Ring very distinct, smooth, 

 somewhat angular. Spines armed with sharp short lateral 

 spinules directed obliquely outward and upward. Spines 

 marked with very fine obscure longitudinal striae. 



Geological formation and locality: Chester Limestone, 

 Liberty, Randolph Co., and Chester, 111. 



14. Archaeocidaris nerii Miinster. 



1840. Cidarites Nerei. Miinster, Beitr, I., p. 40, tab. 3, 



figs. 6 a-d, 

 1840. Cidarites Protei. Miinster, Beitr. I., p. 40. 



1842. Cidaris Protei. Koninck, Desc. Ann. Foss., p. 34, 

 tab. E, figs. 1 a-i. 



1843. Cidaris Nerei. Portlock, Geol. Rep., p. 352. 

 1847. Palaeocidaris Nerei. Desor et Agassiz, Cat. Eais., 



p. 36. 

 1847. Palaeocidaris Protei. Desor et Agassiz, Cat. Rais., 



p. 36. 

 1850. Echinocrinus Nerei. D'Orbigny, Prodrome, vol. 1, 



p. 154. 



