38 



i-adials less than one-fourth as largo as the first, a little wider 

 than long, quadrangular. Third primary radials about the size 

 of the second, pentagonal, axillary, and support upon each uf - 

 per sloping side a single secondary radial, which gives to the 

 species ten ambulacral opiMiings to the vault. 



The first interradial truncates a subi'adial in the azygous 

 area, and in three of the i-ogular interi-adial areas in the other 

 interradial area two plates truncate a subradial, which makes 

 it octagonal, as above stated. The first plate in the azygous 

 area is, however, larger than the first i)late in either of the 

 regular aieas. In thi'ce of the regulai- interradial areas there 

 ar(^ two ])latcs in the second range, and in tlie other area there 

 are three, and in the thii-d range three plates in two of the 

 areas and two in each of the other two areas. The plates in 

 each of th(>.se areas graduate into the ])lates of the vault, so 

 there! is no distinct lin<' of separation between the plates of the 

 calyx and tliose of the vault. In the azygous area there are 

 three plates in the second range, the middle one of which abuts 

 upon the azygous orifice, which is placed midway between the 

 ambulacral openings at the top of the calyx, where it is sur- 

 rounded by seven plates. 



The vault is slightly convex toward the center and corres- 

 pondingly depressed in the interradial areas at the margin. It 

 is covered by, numerous small, ])olygonal, convex plates. 



This is a very strongly marked species and it is wholly un- 

 necessary to compare it with any other, though it is very 

 clearly a Rhodocrinus. 



Found by K. A. Blair, in whose honor we have proiiosed the 

 specific name, in the Chouteau limestone, at Sedalia, Missouri, 

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



F.\Mii,v CYATHOCKINI D.E. 



cvATiiocKiNUs CI loTTKAi'K.vsis, Miller and Clurley. 



PUdc 11, Fig. 2i, view ojtposih' (lie (izijgous <ire<i of a smidl 

 specimen VKKjniJicd two didmcters. 



\Cynlhocrinus rlionleanevsis, Miller and (iurley,. Bull. No. 7 

 of 111 St. Mus. p. (is, pi. IV, lig 1(5, Dec. 5, 189.-).] 



We have a siw'cimen th;\t we suppose belongs to this species, 

 but it is only about on(>fourth as large as the type, and we 



