69 



the exposed area. The' top of the proboscis is broken off in 

 the specimen ilhistrated, below the top of the arms, whore it 

 is round and covered by smooth, polygonal plates. 



This species is at once distinguished, by its general form 

 .and number of arms, from all others. In Zeacrinus pocillnm,- 

 from the same rocks, there are two brachials in eacla of four 

 rays, and. in the other ray, the first brachial is truncated on 

 top and followed by five single jilates, before it bifurcates; and 

 Zeacrinus commalicus, from the same rocks, with its forty-six 

 arms, is equally as far removed from this species. We know 

 of no species with which it is necessary to compare it. '- 



Pound in the Keokuk Group, at Boonville, Missouri, and now 

 in the collection of S. A. Miller. The specific name is in 

 honor of R. A. Blair, the distinguished naturalist and collector 

 of Sedalia, Missouri. ■ • ■ -' • • ■ ' - ■ ■>■'■■■ '■'''- 



,.,,.._., ,, , Family CYATHOCRINID^. . ■• . ,..'" 



''"' ' CYATHOCRINUS Br.ATKT n. sp. '" ' 



Plate IV, Fiji. 11, basal view of a large specimen, azygous side 



vp; Fig. 12, azygous side of same allowing the large • 



siibradial; Fig. 13, basal view of a small 



specimen; Fig. 14, azygous side of 



the same; Fig. lit, opposite 



side of same. . ^ . . 



We have three specimens of this species, though one of them 

 is so badly crushed that it is of no service in the description. 

 The species is rather below medium size. The calyx of the 

 larger specimen is bowl-.shaped. a little less than twice as wide 

 as high and broadly rounded below, while the .smaller specimen 

 is more elongated and pointed below. It is possible, that the 

 larger specimen is compressed on the under side so as to throw 

 it a little out of its normal shape. The sutures are beveled; 

 surface granular; column small and round. 



Basals small and form a low cup, with a concave depression 

 for the attachment of the small column, and are sei^arated from 

 the subradials by a beveled suture. Subradials large and gently 

 curve fro:u the basal cup outwaj-d and upward. The one on 

 the azygou.i side is remarkably lai'ge and extends nearly as 



