12 



The vault is liigh, subconical with a large subcentral proboscis. 

 It is covered with large, tumid, nodose, polygonal plates. The 

 interradial areas are slightly depressed between each pair of arms, 

 where there is a narrow elongated plate and an orifice at each of 

 its inferior angles. This arrangement places one pore on one side 

 of each arm or gives to the species twenty of these so-called 

 ovariau apertures. 



This species is distinguished by its general biturbinate form, 

 expanded basals, smooth calyx, nodose vault, square azygous area 

 and twenty arms. It is a marked species that need not be mis- 

 taken for any heretofore described. 



Found by Prof. A. G. Wetherby, in whose honor we have proposed 

 the specific name, in the Keokuk Group, at White Creek Springs, 

 in Tennessee, and now in the collection of Wm. F. E. Gurley. 



BATOCRINUS LATERNA, n. Sp. 



Plate I, Fig. 13, azijr/ons area on the rigtit ; Fig. 14, basal vieio 

 to sliow titc diameter of tlie basal plates. 



Species rather above medium size and having a lantern shape 

 that suggested the specific name. Vault conical and lai-ger than 

 the calyx. Calyx more than twice as wide as high; basals thin 

 and remaikably expanded in a circular disc; each radial series 

 consists of a sharp ridge that slopes laterally to the sutures, 

 while the interradial areas are flattened and depressed so that a 

 transverse section of the calyx, at any [)oint below the secondary 

 radials, will be sharply pentagonal in outline. The calyx is ab- 

 ruptly expanded above the secondary radials so that the last 

 tertiary radials are directed horizontally, in pairs, with a depress- 

 ed interradial space between them. The angularity of the radial 

 ridges is somewhat like it is in Batocrinits c/(r('o.s».s, but otherwise 

 the calyces have no resemblance to each other. 



The basals form a thin circular disc that has a diameter one- 

 half greater than the height of the calyx, and, in the center of 

 which, on the lower flat side, there is a concave radiately furrow- 

 ed depression for the attachment of the column, and a small 

 round columnar canal. The diameter of the column is about one- 

 fourth the diameter of the basal disc. The first primary radials 

 are short, two or three times as wide as high, have a concave face 

 for the second ratlials, are longitudinally shaiply angular in the 

 middle, and appear as if set down upon the surface of the plane 

 basal disc. Second prin:ary radials short, sharply angular in the 

 middle, quadrangular. Third primary radials very little larger 



