10 



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

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

 flatten more than they really do. Another specimen showing 

 nearly the entire lenf2:th of the arms, shows only a little flat- 

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



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 VETUSTUH, n. Sp. 



Plate I, Fi(]. 5, azytjous side view of the aiJij.r and part of the 

 arms; Fig. C, opposite view of the same specimev. 



Species medium size. Calyx obpyramidal, twice as wide as 

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

 f)lates to the free arms; interradial ai-eas flattened; "sutures 

 slightly beveled; surface granular; truncated for a small 

 column. 



Basals form an hexagonal disc one lialf wider than tlie diam- 

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

 diameter of the column. First i)rimary radials wider than high, 

 upper face slightly arcuate for the reception of the second 

 radials. Second primary radials cpiadrangular, about twice as 

 wide as high. Third [)riuuiry radials jientagonal, 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 ])r'imary radials, in one of the lateral series, 

 as shown on the left of figuin; li. The extra platt; is p<nitag- 

 onal and in.sisrted betwcn-n the second and third jiriuuiry 

 radials. The tliird priiuai'y radials are of im('([iial size, axillary, 

 and bear upon each upper slojjing side secondary radials. On 

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

 are three secondary radials and an axillary i)late that bears 

 two arms, and on the pio.xinial side two secondary radials, the 

 last being axillui'y anl l)eariug upon each upper side two 



