8 



There are three regular interradials, in each area, one, fol- 

 lowed by two of unequal size, in the second range, which are 

 cut off from the plates of the vault by the union of the tertiary 

 radials. The azygous area contains seven plates. The first 

 one is in line with the first primary radials and fully as large 

 as any of them. It is followed by three rather large plates, 

 subequal in size, in the second range, and by three smaller 

 plates in the third range, that are cut off from the plates of 

 the vault by the union of the quaternary plates. 



The vault is covered with highly convex or tumid polygonal 

 plates and bears a subcentral proboscis, which is not preserved 

 in our specimens. 



The general form of this species will readily distinguish it 

 from such twenty- two armed species as B. discoideus> and B. 

 germanus, without calling attention to the extra tertiary radial, 

 in each series, or the differences in the interradial areas. It is 

 more like B. lactus than any other described species, but may 

 be distinguished by the general character of the plates, 

 which is conspicuous when the basals are compared, and by 

 the direction of the arm openings, as well as by the interradial 

 areas. In that species there are two regular interradials in each 

 area, and in this species there are three. In that species there 

 are six azygous plates, and in this species there are seven. In 

 this species the calyx expands more rapidly than in that one, 

 and the vault is elevated, in that species, over the arm openings 

 more than it is in this one. 



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

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



BATOCRINUS HODGSONI, n. Sp. 



Plate J, Fig. 6, azygous side; Fig. 7, side view. The specimen 

 is compressed so as to widen the side view and contract 

 the azygous view. 



Species medium size, biturbinate, calyx larger than the vault. 

 Calyx bell-shaped, rounded below and most rapidly expanding 

 as the arms are approached; nearly as high as wide. Arm 

 openings directed very little above a horizontal line. No 

 radial ridges. Plates convex only in the region of the last 

 radials. Surface smooth or finely granular. 



Basals form a cup about half as high as wide and truncated 

 by a small column and bearing a concave facet for its attach- 

 ment. First radials larger than the basals and rather longer 



