42 



the two were ever coufoimdel with each other. Actinocrinus 

 validus must be restored, as a species, and as it is not a typ- 

 ical Actinocrinus, but approaches Steganocrinus, to which genus 

 it has been referred by some authors, it may be known as 

 Steganocrinus validus, Meek and Worthen. 



We would describe this species from a specimen found in 

 the Burlington Group, at Sedalia, Missouri, and illustrated in 

 this Bulletin, as follows: 



Calyx and vault subequal in capacity. Calyx pentagonal, 

 three or four times as wide as high. Plates pyramidal and 

 radiately sculptured. Column small and round. 



Basals three and forming an hexagonal sculptured disck. 

 First radials about as long as wide, three hexagonal and two 

 heptagonal. Second radials about as large as the first, hexag- 

 onal and notched on the superior side by the ambulacral furrow. 

 The articulating facets described by Shumard for the third ra- 

 dials are the articulating facets for the first plate in the free 

 arms. 



The first regular interradial hexagonal, smaller than the ra- 

 dials and succeeded by two smaller plates that abut upon the 

 second radials and upon the ambulacral furrows and unite 

 with three plates on the vault. The first azygous plate is in 

 line w T ith the first radials and of about the same size. It is 

 followed by two plates, each of which is about the size of the 

 first regular interradials. These plates abut the first plate on 

 the sides of the ambulacral furrows, and are followed by three 

 plates belonging to the vault. 



The vault is convex and covered with highly convex and 

 conical, polygonal plates. The azygous orifice is rather large 

 and subcentral. The arms are unknown. 



Found by K. A. Blair in the Burlington Group, at Sedalia, 

 Missouri, and now in the collection of S. A. Miller. 



MEGISTOCRINUS ORNATUS, n. sp. 



Plate II, Fig. 15, basal view azygous side up; Fig. 16, azy- 

 gous side view; Fig. 17, summit view. 

 Species medium or above medium size. Calyx subhemi- 

 spherical, a little concave below, about twice as wide as high, 

 not constricted below the arms, Surface delicately and ra 



