67 



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

 the specimen illustrated, below the top of the arms, where 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 pocillum, 

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

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

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

 Zeacrinus commaticus, 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. 



Found 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 BLAIRI n. Sp. 



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

 up; Fig. 12, azygous side of same showing the large 

 subradial; Fig. 13, basal view of a small 

 specimen; Fig. 14, azygous side of 

 the same; Fig. 15, 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 separated from 

 the subradials by a beveled suture. Subradials large and gently 

 curve from the basal cup outward and upward. The one on 

 the azygous side is remarkably large and extends nearly as 



