LO 



The arms, in the specimen illustrated, are broken off and 

 eroded toward the top, which causes the arms to appear to 

 flatten more than they really do. Another specimen showing 

 nearly the entire length of the arms, shows only a little flat- 

 tening at the tips — about the same shown in B. venustulus. 



This species is distinguished by its general form, number of 

 interradials, and the peculiarity in the arrangement of its 

 twenty-nine arms. 



Found in the Keokuk Group, at Boonville, Missouri, and now 

 in the collection of S. A. Miller. 



BATOCRINUS VETUSTUS, n. Sp. 



Plate 7, Fig. 5, azygous side view of the calyx and part of the 

 arms; Fig. 6, opposite view of the same specimen. 



Species medium size. Calyx obpyramidal, twice as wide as 

 high; each radial series bears an angular ridge from the basal 

 plates to the free arms; interradial areas flattened; sutures 

 slightly beveled; surface granular; truncated for a small 

 column. 



Basals form an hexagonal disc one half wider than the diam- 

 eter of the column and having a height less than half the 

 diameter of the column. First primary radials wider than high, 

 upper face slightly arcuate for the reception of the second 

 radials. Second primary radials quadrangular, about twice as 

 wide as high. Third primary radials pentagonal, except in the 

 typical specimen, the one on the right of the azygous area is 

 hexagonal, and the one opposite the azygous area is heptag- 

 onal, as shown in figure 5. Moreover, in the typical exam- 

 ple, there are four primary radials, in one of the lateral series, 

 as shown on the left of figure 6. The extra plate is pentag- 

 onal and inserted between the second and third primary 

 radials. The third primary radials are of unequal size, axillary, 

 and bear upon each upper sloping side secondary radials. On 

 the right side of the azygous area, on the distal side, there 

 are three secondary radials and an axillary plate that bears 

 two arms, and on the proximal side two secondary radials, the 

 last being axillary and bearing upon each upper side two 



