36 



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

 is altogether different from the regular interradial areas, and 

 the oriilcc 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 

 Baiocrinus in some respects, but the essential characters enable 

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



Pound in tlie Keokuk Group, at Boonevillo, Missf)uri, and 

 now in the collection of S. A. Miller. 



BATOCRINUS INOPINATUS, n. Sp. 



Plate If, Fig. 4, basal view; Fig- 5, azygous side; Fig. (1, 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- 

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

 tween two and three times as wide as- long. Third ])rimary 

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

 hexagonal, axillary, and each one adjoining the azygous area 

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

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

 which is axillary, and bears u])()n each upper sloping side a 

 single tertiary radial, and tli(> (jIIku- one bears, on the proximal 

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

 and bears ujion one up2)er sloping side two tertiary radials, and 

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

 One of the lateral rays boars u])on one of the superior sloping 

 sides of the third priinaiy radial three seccmdary 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 

 t'le third primary radial bears upon each upper sloi)ing side 



