Beede. I Carboniferous Invertebrates. 39 



the cavity in the base is deeper and the calyx is not so high. 

 It may belong to Stemmatocrinus^ as the infrabasals are not 

 known, but as that genus is not yet known from this country, 

 it is more probable that it is an Erisocrinus. 



Erisocrinus typus. Plate VI, tigs. 4 41>. 



Erisocrinvs (>/))iix Meek and Worthen, Amer. Jour. Sci., xxix, p. 174, 

 1865); Geol. Surv. 111., ir, p. 317, f. 33; Meek, Fin. Rep. U. S. Geol. 



Surv. Neb., p. 146, pi. i, ff. 3, a, b, (1872); Meek and Worthen, Geol. 



Surv. 111., v, p. 561, pi. xxiv, f . 6. (1873); White, Geol. Uinta Mountains, 



(Powell's Rep.), p. SO, I 1876 i : Cont. Inver. Pal.. No. 6, p. 126, pi. xxxin, 



f. 5a, (1880). 

 Erisocrinus nebrascensis Meek and Worthen. Amer. Jour. Sci., xxxix, 



p. 174, (1865 i. 

 Philocrinus pelvis Meek and Worthen, Amer. Jour. Sci., xxxix, p. 350, 



'1865 i. 



Meek's description: "''Body below the summit of the first 

 radials [radials], basin-shaped, rounded below, and obscurely 

 subpentagonal in outline as >qq\\ from above or below ; com- 

 posed of thick, smooth, slightly convex plates. Basal pieces 

 [infrabasals] small, occupying a shallow convexity of the under 

 side, about half hidden by the column, all pentagonal in exter- 

 nal form. Subradial [basal] considerably larger than the basal 

 [infrabasal] , and all equally hexagonal in form. First radial 

 [radial] pieces four or five times as large as the subradials 

 [basals], wider than long, equal, and all pentagonal; support- 

 ing upon their broadly and evenly truncated superior sides the 

 second primary radials [costals], which are of nearly the same 

 size and form as the first, but have their sloping sides above 

 instead of below, while they each support above two first bra- 

 chials [distichals] , or a series of secondary radials [distichals] 

 yet unknown. Surface smooth. Breadth of body below the 

 first primary radials, 0.72 inch ; height of same, 0.35 inch.*' 



Range and distribution : The specimen here under discussion 

 is from the Upper Coal Measures, Jefferson county, and now in 

 the collection of Washburn College. 



The specimen is a beautifully preserved calyx and a single 

 costal. It difl ry materially from the type specimen 



figured by Meek and Worthen. The calyx is much higher, 

 which is due largely to the very much larger basals, which, in- 



