68 



high as the first radials. First radials wider than high, sides 

 parallel, each arcuate the entire width above for the attach- 

 ment of the second plate, and having the facet directed up- 

 ward or slightly inclined inward. The first azygous plate is 

 short and extends but slightly below the level of the first ra- 

 dials. 



This species will be distinguished by its general form, re- 

 markably large subradial which is truncated by a short azygous 

 plate, and by the wide arcuate facets directed upward and in- 

 ward, for the attachment of the second radials. Possibly its 

 arms, when known, will be used to distinguish it from the genus 

 Cyathocrinus. 



Found by R. A. Blair, in the Choutean limestone at Sedalia, 

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

 cific name is in honor of the laborious and intelligent collector. 



CYATHOCRINUS CHOUTEAUENSIS, n. Sp. 



Plate IV, Fig. 16, showing calyx and part of the arms, the azy- 

 gous plate is on the right and the second and third 

 radials in the adjoining ray are out of place, 

 the calyx is also compressed so as 

 to appear wider than it is. 



Species medium size. Calyx obconoidal, about as high as 

 wide, sutures close, surface granular. 



Basals form a low conical cup, truncated for a small column. 

 Superior angles obtuse. Subradials rather longer than wide, 

 except the one truncated by the azygous plate which is wider 

 than long, four hexagonal and one heptagonal. The heptagonal 

 plate is the larger one. First radials about as long as wide, 

 slightly curved over towards the vault on each side of the arm 

 facets, and longitudinally convex and protuberant at the 

 arm facets. Arm facets circular, occupying about half the width 

 of the plates, and notched for the ambulacral canal. Azygous 

 plate broadly truncates a subradial and extends above the top 

 of the first radials. 



There are only five arms. The arms are small, long and 

 composed of long, round joints or plates. The first plate is 

 not quite as long as wide but above this the plates are from 

 two to four times as long as wide. 



