18 



and nearly as large and in line with them. It is followed by three 

 plates in the second range, which are subequal, in size. These 

 are followed by two plates in the third range that unite with 

 three plates belonging to the vault. 



The vault is obconoidal and is produced in a large subcentral 

 proboscis. It is covered with numerous, convex, polygonal 

 plates. 



This species most resembles B. adamsensis and seems to have 

 no near affinity with any other described species. The two spe- 

 cies, however, may be readily distinguished by the general form, 

 for this species is much more elongate and biturbinate, in outline, 

 than that species. There is only one secondary radial in this 

 species, and there are two in that. The plates in the azygous 

 areas are quite different, and there is one more range, having 

 three plates, in that species, than there is in this. 



Found in the Burlington Group, by R. A. Blair, at Sedalia, 

 Missouri, and now in the collection of S. A. Miller. 



BATOCR1NUS CISTULA, n. Sp. 



Plate I, Fig. 24, azygous view, a little comj>ressed on one side; 

 Fig. 25, basal view; Fig. 26, summit view. 



This species is medium size. Calyx bowl-shaped, moderately 

 truncated below and rounding and spreading to the arms: 

 about twice as wide as high. Plates moderately convex ami 

 beveled toward the sutures. Ambulacral openings directed up- 

 ward at an angle of ten to twenty degrees. No radial ridges. 



The basals form an hexagonal disc thai bears a rounded rim 

 or band around the end of the column. The disc bears a con 

 cave, radiately furrowed depression for the attachment of the 

 column- First primary radials large, from one half wider to 

 twice as wide as long, three hexagonal, two heptagonal. 

 Second primary radials, about half as large as the first, quad- 

 rangular, from two and a half to three times as wide as long. 

 Third primary radials about as large or smaller than the 

 second primary radials, two hexagonal, Ihree pentagonal, 

 axillary, and in four of the rays support upon each superior 

 sloping side two secondary radials, the last being axillary and 

 bearing upon each upper sloping side two secondary radials, 

 In some of the rays there are three secondary radials, which 

 gives to each of these rays four arms. In the ray opposite 

 the azygous area the third primary radial bears upon each 

 upper side three >< mm mda ry radials, which gives to this ray 

 two arms. There are, therefore, eighteen arms in this species 

 and eighteen arm openings to the vault. 



