72 Trans. Acad. Sci. of St. Louis. 



1874. Eocidaris scrobiculata. Loven, Kongl. Sveus. Vetens. 

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

 Geological formation and locality : Devonian, Villmar duchy 

 of Nassau. 



3. Eocidaris sp. ind. Julien. 



1874. Eocidaris sp. ind. Julien, Coinpt. Rend. Acad. Sci. 

 Paris, t. 78, p. 76. 

 Geological formation and locality: Carboniferous, l'Ar- 

 doisiere, France. 



c. Lepidocidaris Meek and Worth en 1873.* 



General form spherical. Interambulacra very broad with 

 eight or more columns of plates in each area. Plates imbri- 

 cate laterally and aborally. Each interambulacral plate has 

 one large central tubercle surrounded by a ring. Spines 

 cylindrical, thin, finely striated and swollen at the base. 

 Ambulacra small, slightly arched, imbricating, the whole 

 plates alternating with wedge-shaped half plates. 



1. Lepidocidaris squamosus Meek and Worthen. 



1869. Eocidaris ? squamosa. Meek and Worthen, Proc. 

 Acad. Nat. Sci. Phil., p. 79. 



1873. Eocidaris ? squamosus. Meek and Worthen, Geol. 

 Surv. 111., vol. 5, p. 478, pi. 9, fig. 15. 



1874. Lepidocidaris squamosus. Loven, Kongl. Svens. Vet- 

 ens. Akad. Handl., Bd. 11, no. 7, p. 44. 



1889. Lepidocidaris squamosus . N.Amer. Geol. Pal., p. 258. 



1895. Lepidocidaris squamosus. Keyes, Proc. Iowa. Acad. 

 Sci., vol. 2, p. 193. 



1896. Lepidocidaris squamosus. Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p. 220, pi. 7, fig. 41. 



Interambulacral plates imbricate aborally and toward the 

 central column, except the adambulacral plates which imbri- 



* Proc. Acad. Nat. Sci. Phil., 1873, p. 79. 



