2 1 



Found by B. A. Blair, in the Burlington Group, near Sharon, in 

 the southwest part of Missouri, and now in the collection of S. A. 

 Miller. 



BATOCRINUS SENEX, U. sp. 



Plate I, Fig. 12, azygous side; Fig. 13, opposite view of same speci- 

 men; Fig. 14. summit view of another specimen. 



Species below medium size,' biturbinate. Calyx obconoidal, most 

 rapidly spreading at the arms, more than one and a half times as 

 wide as high. No radial ridges, but depressed at the upper part of the 

 interradial areas leaving the radial series projecting at the bases of 

 the arms. Plates smooth, the larger ones slightly convex.. Ambu- 

 lacral openings not visible in a basal view, but conspicuous in a sum- 

 mit view. An ovarian pore on each side of the radial series oppo- 

 site the azygous area, others not discovered. 



Basals form a low expanding cup nearly four times as wile as 

 high and having an hemispherical depression below, for the attach- 

 ment of the column, which has a diameter equal to the truncated 

 end of the calyx. No basal rim. First primary radials large, nearly 

 as long as wide, three hexagonal, two heptagonal. Second primary 

 radials quadrangular, two or three times as wide as long, and less 

 than half as large as the first. Third primary radials about half as 

 large as the first, the two adjoining the azygous area hexagonal, the 

 other three pentagonal, and in the ray opposite the azygous area 

 supports on each upper sloping side two secondary radials, which 

 gives to this ray two arms. In each of the lateral rays the third 

 primary radial bears upon one upper sloping side three secondary ra- 

 dials and upon the other two secondary radials. the last being axil- 

 lary and supporting, on each upper sloping side, a single tertiary 

 radial, which gives to each of these rays three arms. In the ray on 

 each side of the azygous area, the third primary radial bears upon 

 the distal side three secondary radials and upon the proximal side 

 two secondary radials, the last being axillary and bearing, upon one 

 upper side, a single tertiary radial, and upon the other two tertiary 

 radials, which gives to each of these rays three arms. There are, 

 therefore, fourteen arms in this species. The arm formula is 'A 'A 



In each of three regular interradial areas, there are three plates, 

 one in the first range and two elongated plates in the second range, 

 one of which connects with a plate belonging to the vault. In the 



