86 



large plates bearing spines on the ' vault, and the azygous area 

 is altogether different from the regular interradial areas, and 

 the orifice is directed laterally from a more or less bulbous 

 protuberance, neither of which characters exist in this species. 

 It is true, however, that, in some respects, this species is allied 

 to Dorycrinus, and is widely different from the most typical 

 Batocrinus in some respects, but the essential characters enable 

 us, without hesitation, to refer it to the latter genus. 



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

 now in the collection of S. A. Miller. 



BATOCRINUS INOPINATUS, n. Sp. 



Plate II, Fig. 4, basal view; Fig. 5, azygous side; Fig. 6, sum- 

 mit view. 



Species below medium size. Calyx short, obconoidal, diame- 

 ter more than twice the height. Radial ridges present, but not 

 very well defined. Surface granular. Column round and quite 

 small. 



Basals form an hexagonal disc or very low cup that bears a 

 rim below the first primary radials, and has a diameter about 

 twice as great as the diameter of the column. First primary 

 radials a little wider than long, three hexagonal, two heptag- 

 onal. Second primary radials, quadrangular, very short, be- 

 tween two and three times as wide as long. Third primary 

 radials one-half larger than the second, three pentagonal, two 

 hexagonal, axillary, and each one adjoining the azygous area 

 bears, on the distal side, two secondary radials, and one of 

 them bears, on the proximal side, a single secondary radial 

 which is axillary, and bears upon each upper sloping side a 

 single tertiary radial, and the other one bears, on the proximal 

 side, two secondary radials, the last one of which is axillary, 

 and bears upon one upper sloping side two tertiary radials, and 

 upon the other, one, giving to each of these rays three arms. 

 One of the lateral rays bears upon one of the superior sloping 

 sides of the third primary radial three secondary plates, and 

 upon the other two secondary radials, the last of which is ax- 

 illary, and bears upon each upper side a single tertiary radial, 

 which gives to this ray three arms. In the other lateral ray 

 the third primary radial bears upon each upper sloping side 



