124 KANSAS UNIVERSITY QUARTERLY. 



Measurements: Height. Width. 



Basals lo mm. lo mm. 



Radials 6 " ii " 



Costals 5 " lo " 



Distichals 5 " 7 " 



Arms 53 " H " 



Pinnules ii " >^ " about. 



Taken from the shales above the Osage coal at the Capital Coal 

 mine near Topeka, Kansas. 



There is a little doubt about this being a true Ceriocriniis on ac- 

 count of the nature of the arms and the fact that all the specimen 

 is not exposed. The nature of the infrabasals can not be made out. 

 There are three radials exposed, the central one supporting two 

 arms, and the other two four arms each. Until more of its char- 

 acters are known it is referred provisionally to this genus.* 



Eri-50crinus megalobrachius, n. sp. Plate XXXII, Figs. la, ib 



Calyx basin-shaped, base quite concave, ornamented by very 

 coarse granulations which are sometimes arranged in wavy rows. 

 Infrabasals unknown, covered by the small column. Basals large, 

 convex, the lower portion curved upward to meet the infrabasals 

 forming a deep cavity in the base of the cup, the inner, or lower, 

 end of the basals being in about the same horizontal plane as the. 

 upper end and hence forming the most of the base of the calyx and 

 leaving the infrabasals almost entirely within the calyx; higher 

 than wide, all equal, and apparently pentagonal, the lower side 

 (or sides, if two) short, superior and interior lateral edges nearly 

 equal and the apical angles extending upward between the radials 

 to fully half the height of the latter. Radials five, equal, pen- 

 tagonal, twice as wide as high, massive, convex, considerably 

 beveled at the upper edge; upper surface deeply faceted for the 

 reception of the costals, raised portions of the facet crenulated. 

 Costals five, massive, stoutly spine-like, pentagonal in outline, the 

 lower inner surface faceted to meet the radials, upper surface 

 faceted (except the portion protruding in the form of a stout spine) 

 to support the two large arms. Distichals either one or two to 

 each arm, more commonly two in our specimen, the lowermost 

 quadrangular in outline, massive, a little more than twice as wide 

 as high; the second distichals very variable, from four to six times 

 as broad as high. There are ten arms which are very broad and 

 stout, each made up of two series of wedge-shaped, interlocking 



♦Since this was written another specimen has been seen with an anal plate. The two 

 seem to be the same species or, at least, nearly related. 



