I 



12 



Basals form an hexagonal disc more than one-half wider than 

 the diameter of the column. First primary radials very large, 

 about as high as wide, three hexagonal, two heptagonal. Sec- 

 ond primary radials quadrangular, from three to four times as 

 wide as long. Third primary radials a little larger than the 

 second, about three times as wide as long, pentagonal, axillary, 

 and in three of the rays bear upon each upper sloping side two 

 secondary radials, which gives to each of these rays two arms. 

 In each ray adjoining the azygous area there are two second- 

 ary radials on the distal side of the third primary radial and 

 two on the proximal side, the last being axillary, which gives 

 to each of these two rays three arms. There are, therefore, 

 twelve arms in this species. The arms are very strong and, 

 above the first two or three cuneiform plates, are composed of 

 a double series of interlocking plates as is usual in this genus 

 The arms are subfusiform and slightly flattened at the superior 

 ends. 



There is one plate in each of the regular interradial areas. 

 The first azygous plate is in line with the first primary radials 

 and the largest plate in the body. It is followed by three plates 

 in the second range which separate the secondary radials and 

 unite with three plates belonging to the vault. 



The vault is conoidal. Proboscis not exposed in our speci- 

 men. 



This is the second species ever described from the Keokuk 

 Group having twelve arms. The other is B. prcegravis, to 

 which this one has no resemblance. This species is distin- 

 guished by its general form, twelve arms and wide azygous 

 area and cannot be mistaken for any other. 



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

 now in the collection of Wm. F. E. Gurley. 



BATOCRINUS DELICATULUS, n. sp. 



Plate 1, Fifj. 20, azygous side of a specimen somewhat compressed 

 magnified two diameters; Fig. 21, opposite side view 

 of same magnified two diameters. 

 Species very small and delicate, somewhat biturbinate. Calyx 

 obpyramidal, twice as wide as high. Plates convex, more or 

 less angular. Radial ridges well defined, interradials depressed, 

 and all the interradial areas connect with the vault. 



