22 



ond primary radial, and is followed by two plates in the second 

 range that connect with the plates of the vault. The first azygous 

 plate is in line with the first primary radials and somewhat smaller. 

 It is followed by two plates in the second range, and by three in 

 the third range, that connect with the plates of the vault. 



The vault is depressed convex and bears a subcentral proboscis, 

 but the matrix adheres, in our specimens, so as to prevent a full 

 description of it. 



This species is so different from all others that have been de- 

 scribed that no comparison is necessary. 



Found by Miss Jessie Blair, in whose honor we have proposed 

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

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



BATOCRINUS NODOSARIUS, n. sp. 



Plate I, Fig. 11, side view, with azygous area on the right; 

 Fiq. 12, summit view. 



Species medium or below medium size, biturbinate. Calyx ob- 

 conoidal, in the lower part, and spreading, nearly horizontally, in 

 the superior part, truncated at the base; about twice as wide as 

 high; arm openings directed horizontally; plates convex, the larger 

 ones tumid; surface granular. 



Basals form a low cup or hexagonal disc, with slight re-enter- 

 ing angles, about twice as wide as the diameter of the column. 

 It is constricted, in the upper part, and the plates extend a little 

 below the point of columnar attachment. First radials tumid, 

 about one-half wider than high, three hexagonal, two heptagonal. 

 Second primary radials short, quadrangular, three or four times 

 as wide a3 long. Third primary radials about twice as large as 

 the second, pentagonal, axillary, and in each lateral ray, and, in 

 the ray on each side of the azygous area, bear, upon each upper 

 sloping side, two secondary radials. The second secondary radials 

 are axillary, and, in each of the lateral rays, bear, upon each su- 

 perior sloping side, two tertiary radials, which gives to each of 

 these rays four arms. The proximal sides of the secondary radials, 

 ia each ray adjoining the azygous area, bear two tertiary radials, 

 and the distal sides bear a single tertiary radial, which is axillary, 

 and supports, upon one side, a single quaternary plate, and, upon 

 the other, two quaternary plate3, which arrangement gives to each 



