38 



Bisals form x cup about twice as wide as high. First radials 

 the largest plates in the body, and nearly as long as wide, three 

 hexagonal, two heptagonal. Second and third radials together 

 much smaller than the first. Second radials quadrangular, three 

 or four times as wide as long. Third radials a little larger than 

 the second, pentagonal, axillary, and support upon each superior 

 sloping side two secondary radials, the last ones being axillary 

 and supporting upon each upper side two tertiary radials, except 

 in the ray opposite the azygous area where the second secondary 

 radial upon one side supports an intersecondary plate, and not an 

 arm, which arrangement gives to this species nineteen arms. The 

 arm formula is 4+4+34-4+4. 



Regular iuterradial areas very unequal. One has six plates, 

 another five, another four, and the other three. The one that has 

 four plates has one in the first range, two in the second, and an 

 elongated plate in the third, which reaches a vault plate. The 

 other areas are cut off from the vault by the union of the tertiary 

 radials. There are eleven plates in the azygous area. The first 

 one is in line with the first primary radials, but somewhat smaller. 

 It is followed by three plates in the second range, and five in the 

 third range, the middle one being much the largest. There is 

 one small plate on the right of the latter. The middle plate in the 

 third range unites with an elongated plate that separates the ter- 

 tiary radials and extends over upon the vault. 



Vault depressed convex, covered with smooth, polygonal plates, 

 and bears a subceutral proboscis. No ovarian pores. 



The form of this species is altogether different from other nine- 

 teen-armed species, and cannot be mistaken for any other species. 



Found in the Burlington Group, at Sagetown, Illinois, and now 

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



BATOCRINUS .\LBERSI, n. sp. 



Plate II, Fig. 6, azygous side having fhe basal plates broken 

 away; Fig. 7, basal view; Fig. 8, summit. 



Species above medium size, trochiform. Calyx abruptly spread- 

 ing, almost horizontally, from the region of the second and third 

 primary radials. Surface of the plates plane and smooth, and 

 generally very large, and the last radials project beyond the sum- 

 mit plates. 



