in each regular area, and fifteen or sixteen in the azygous 

 area, and all the areas connect with the vault. In B. turbina- 

 ius, there are three plates, one following the other, or three 

 ranges, the middle one having two plates in each regular inter - 

 radial area, and ten plates in the azygous area, the last one of 

 which is elongated and connects with the plates of the vault. 

 In B. turbinatus, var. elegans, there arc three plates in each 

 regular area, one following the other, and eight or nine plates 

 in the azygous area. B. aspratilis and B. laeius were described 

 from Sedalia, Missouri, and among the forms received from 

 there we have recognized B. discoideus and B. turbinatus, which 

 were described from Burlington, Iowa. 



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

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



BATOCRIXI'S PROXIMUS, U. Sp. 



Plate I, Fig. 4, basal view; Fig. 5, side view. 



Body medium size, somewhat biturbinate, though the calyx 

 is larger than the vault. Calyx obconoidal, most rapidly 

 spreading toward the free arms, truncated at the base, a little 

 less than twice as wide as high; arm openings directed upward 

 at an angle of twenty or thirty degrees: plates tumid, leaving 

 the sutures much depressed; surface finely granular. 



Basals form a short, hexagonal disc, with slight re-entering 

 angles. The disc is notched at the sutures, and has a round, 

 deep, columnar depression for the attachment of the column; 

 it is less than twice the diameter of the column. The basal 

 plates expand below and project cuneiform edges below the end 

 of the column. First radials from one-half wider to twice as 

 wide as long, three hexagonal, two heptagonal, with the supe- 

 rior edges slightly arcuate. Second primary radials quadran- 

 gular, from two to two and a half times as wide as high. Third 

 primary radials larger than the second, pentagonal, axillary, 

 and bear upon each superior sloping side two secondary radials. 

 The second secondary radials are axillary, and, in three of the 

 rays, bear upon each superior sloping side two tertiary radials. 

 which gives to each of these rays four arms. The distal side 

 of each ray, adjoining the azygous area, is constructed in the 

 same way, but the proximal side of each bears an axillary, 

 tertiary radial that supports quaternary plates, which arrange- 

 ment gives to each of these rays five arms. There are, there 

 fore, twenty-two arms in this species. 



