Bkede.] Carboniferous Invertebrates. 2V) 



or perhaps the calyx and costals together. Arm plates rounded 

 on the exterior, not at all or very slightly wedge-shaped at 

 the base, and moderately stout. Pinnulse present and of mod- 

 erately large size. 



Height. Width. 



Column 8 mm. 



Infrabasals 3 mm. ."> " 



Basals 10 » 11 " 



Radials 8 •' 14 " Rlgh 'Sa2? Mor 



First interradial 8 " 9J " ( smaller. 



Second interradial 5 " 6 " 



Special anal 8 " 8 " 



Costal (5 " 11 " 



Calyx 17 " '28 " 



Range and distribution : Upper Coal Measures ; Topeka, 

 Kan., from the horizon of the Osage coal. Now in the collec- 

 tion of Washburn College, in honor of which it is named. 



This species seems to belong to the Poteriocrinoidea, though 

 there is some difficulty in locating it generically, as it seems to 

 combine some of the characters of several genera. It agrees 

 with Hdmocrinus in having a round dorsal canal piercing the 

 first radials, but differs from it in that it has pinnules, a robust 

 calyx, and the entire top of the radials truncated. According 

 to the definition of PoteriocrinuSj the presence of the round dor- 

 sal canal in the radials removes it from that genus, as would 

 also the fact that the facets of the radials face upward rather 

 than outward. It differs from Scaphiocrinus in having a circu- 

 lar column, and the fact that the transverse ridge does not oc- 

 cupy nearly the whole of the upper surface of the radials and 

 the brachials are not long. However, it agrees in other respects 

 with this genus better than any other, and it is provisionally 

 referred to it. 



ZEACRINUS. 



Troost, Cat. Foss.. | 1850 I. 

 Hall, GeoL Surv. Iowa, p. 541, i 18! - 



Zeacrinus? robustus. Plate VI, figs. 1, la. 



Zeacrinu8f lobu&tua Beede, Kans. Univ. Quart., t, p. 21, pi. \, ff. 1, la. 



Calyx shallow, saucer-shaped or nearly Hat, unsymmetrical, 

 five or six times as broad as high, deeply concave at the base ; 

 plates tumid, and the sutures are in depression ; surface finely 

 granular. Infrabasals five, equal, half concealed by the col- 



