21 



This species is distinguished by its general form, convex 

 plates, union of interradials with the plates of the vault, and 

 by having twelve arms. It cannot be mistaken for any other 

 described species. 



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

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



BATOCRINUS INCULTUS, n. Sp. 



Plate I, Fig. 19; azygous view; Fig. 20, opposite azygous side. 



We have four specimens which we refer to this species, 

 though there is some difference in the azygous areas. None 

 of them show any arms. Species below medium size. <3alyx 

 urn-shaped and nearly as high as wide. Plates highly convex; 

 no radial ridges; sutures distinct. Column round, rather large 

 and having a cinque foil canal. 



Basals form an elevated hexagonal cup about twice as wide 

 as the diameter of the column and having an hemispherical 

 depression below, for the insertion of the column. The first 

 primary radials are the largest plates in the body, except the 

 first azygous plate, and have a height nearly equal to the 

 width. Second primary radials, quadrangular, and about or 

 less than one- half wider than high. Third primary radials 

 considerably larger than the second, and pentagonal or hexa- 

 gonal, depending on the number of plates they abut upon, in 

 the interradial areas, axillary, and support on each of the 

 superior lateral sides two secondary radials, each of which 

 bears a single arm. There are, therefore, ten arm openings 

 to the vault, in this species. 



The regular interradial areas are elongated and generally 

 have four plates, but sometimes only three. There is one in 

 the first range, generally two elongated plates in the second 

 range, but sometimes only one, and one elongated plate in the 

 third range that connects with the plates of the vault. The 

 azygous area is large, and the number of plates is not uniform. 

 The first plate is in line with the first primary radials and 

 fully as large as any of them. It is followed, in the specimen 

 illustrated, in the second range, by four plates, but, in other 

 specimens, there are only three. Above these, in the speci- 



