22 KANSAS UNIVERSITY QUARTERLY. 



plate, together with the special anal, supports the posterior portion of 

 the ventral sac (apparently two columns of plates), which seems to be 

 comjjosed of rather stout five- to seven-sided plates, with no, or very 

 small, pores at the angles; they have a botrioidal surface. At one 

 side and on the top of the sac there seems to be a madreporite plate 

 pierced by good-sized pores. The sac was apparently about the size 

 of the calyx, 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. Pinnuhi? present and of moderately 

 good size. 



Measurements. Height. Width. 



Column 8 mm. 



Infrabasals 3 mm. .5 " 



Basals 10 " 11 " 



Radials 8 " 14 " (right posterior smaller). 



First interradial 8 " 9i " 



Second interradial 5 " 6 " 



Special anal 8 " 8 " 



Costal 6 " 11 " 



Calyx 17 " 28 " 



Position and locality : Upper Coal Measures ; Topeka, Kan., from 

 the horizon of the Osage coal. Now in the collection of Washburn 

 College, in honor of which it is named. 



The 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 Homocrinus 

 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 Poteriocrinus, 

 the presence of the round dorsal canal in the radials removes it from 

 that genus, as would also the fact that the facets of the radials face 

 upwards rather than outwards. It differs from ScapJiiocrinus in 

 having a circular column, and the fact that the transverse ridge does 

 not occupy 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 bt^tter than any other, and it is provisionally referred to it. 



Zeacrinus? robusius, n. sp. Plate V, figs. 1, la. 



Calyx shallow, saucer- shaped or nearly flat, unsymmetrical, five or 

 six times as broad as high, deeply concave at the base ; plates tumid, 

 and the sutures are in depressions ; surface finely granular. Infra- 

 basals five, equal, half concealed by the column, deeply concave and 

 superior to the basals, forming a large elevation in the interior of the 

 cup, nearly one-fourth its entire width and fully one-half its height ; 

 column round, comi)osed of thin plates, which are carinated, and the 



