17 



Basals form an hexagonal disc, with slightly re-entering angles, 

 more than twice as wide as the diameter of the column and hav- 

 ing a concave depression for the attachment of the column. 

 First primary radials wider than long, three hexagonal, two hep- 

 tagonal. Second primary radials quadrangular, two or three times 

 as wide as long. Third primary radials about one-half larger than 

 the second, pentagonal, axillary, and in the ray, on each side of 

 the azygous area, support, on each sloping side, a single second- 

 ary radial, which is axillary and supports, on each superior side, 

 a tertiary radial, which gives to each of these rays four arms. In 

 each of the other three rays the third primary radial supports, on 

 each upper side, a single, large, secondary radial, which gives to 

 each of these rays two arms. There are, therefore, fourteen am- 

 bulacral openings to the vault in this species. The arm formula 

 is 4+2+2+2+4. 



There is only a single plate in each regular interradial area, 

 and it is cut oh* from the vault by the union of the secondary 

 radials. In the azygous area there are four plates. The first one 

 is in line with the first primary radials and somewhat smaller 

 than either of them. It is followed by three plates in the second 

 range, the middle one of which unites with an elongated plate 

 that belongs to the plates of the vault. 



Vault highly convex, covered with rather large, polygonal, planp, 

 smooth plates, and bears a subcentral, azygous orifice, without a 

 proboscis. Ambulacral openings directed above an horizontal line 

 and not visible in a basal view. No ovarian pores discovered. 



This species bears no resemblance, in form or surface orna- 

 mentation, to any other fourteen-armed species. It would seem to 

 have the nearest affinity with B. politics, from which it is distin- 

 guished by having only one secondary radial instead of two, by 

 having fourteen arms instead of thirteen, by having no proboscis, 

 and other minor differences. 



Found in the Burlington Group, at Sagetown, Illinois, and sev- 

 eral specimens are in the collection of F. A. Sampson. 



BATOCRINUS SPECIOSUS, n. Sp. 



Plate II, Fig. 24, azygous side; Fig. 25, opposite view; Fig. 26, 



summit. 



Species medium size, biturbinate. Calyx obpyramidal, moder- 

 ately truncated below, slightly constricted at the top of the basal 

 disc, most rapidly spreading at the base of the arms, more than 

 one-half wider than high. Radial ridges present. Surface of in- 

 terradials smooth. Arm openings directed nearly horizontally. 



