14 



There are three regular interradials in each area, one 

 pyramidal plate followed by two small ones that are cut off 

 from the vault by the tertiary radials. There are four plates 

 in the azygous area. The first one is in line with the first 

 primary radials of the same size. It is followed by only two 

 plates in the second range and one plate in the third range, 

 which is cut off from the vault by the tertiary radials. 



The sculpturing of this species is quite different from that 

 of any other twenty armed species. The form, too, is different 

 and so is the azygous area. It connot be mistaken for any 

 other species. 



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

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



BATOCRINUS ADAMSENSIS, n. Sp. 



Plate I, Fig. 33, azygous side; Fig. 34, opposite view; Fig. 35, 



summit view. 



Species below medium size. Calyx bowl -shaped, slightly 

 pentagonal, which is most strongly marked when seen from 

 above; less than one -half wider than high. Plates convex; 

 sutures distinct. Radial ridges undefined, though interradiai 

 areas are somewhat flattened. Surface finely granular. 

 Column medium size and pierced by a large, cinquefoil canal. 



Basals form a low, hexagonal disc, which slightly expands 

 upward and has a diameter full twice as great as the diameter 

 of the column. The lower and outward sides of the basals are 

 convex or rounded. The first primary radials are large and 

 have a height nearly as greac as the diameter, three hexagonal 

 and two heptagonal. Second primary radials small, quad- 

 rangular, two or three times as wide as high. Third primary 

 radials ahout twice as large as the second, pentagonal, axillary 

 and support on each superior sloping side two secondary 

 radials. There are, therefore, ten arms in this species. 



All of the interradiai areas connect with the plates belong- 

 ing to the vault. In the regular interradiai areas the first 

 plate is followed by two elongated plates in the second range, 

 which unite with one or two plates which separate the arms 

 and unite with the plates of the vault. In the type specimen, 

 two plates may be distinguished in the third range, in three 

 of the areas, but]in the other area only one can be distinguished, 

 though possibly there are two also. The , first plate in the 

 azygous area is the largest plate in the body. It is longer 



