25 



area has an axillary, tertiary radial, so tliat each of these rays 

 has five arm opening's to the vault. This , gives to the species 

 twenty-two arm openings to the vault. 



There are two regular interradials in each area; the first one 

 is very tumid, and about as large as the second and third pri- 

 mary radials together; the second one is about one-third as 

 large as the first and quite convex. The azygous area is about 

 as wide as high and contains six plates. The first one is in line 

 with the first radials and fully as large and tumid. It is followed 

 by three plates, in the second range, and two in the third, all 

 of which are tumid and subequal in size. 



Vault elevated, above the arm openings, and gently convex, 

 toward the central part, and bearing a coarse, central proboscis. 

 It is composed of irregular, polygonal, subspinous plates, ar. 

 ranged, so far as discovered, without order, in respect to the 

 different radial areas. The proboscis commences, at the base, 

 with a very lar<;e, transversely tumid plate, opposite the azygous 

 side. The length of the proboscis is unknown. 



This species is so different from all others bearing twenty -two 

 arms, that no comparison is necessary to distinguish it. 



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

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



BATOCRINUS .GQUABILIS, n. sp. 



Plate V, Fig. 13, azygous view; Fig. 14, view opposite the 

 azygous side; Fig. 15, summit of same specimen. 



Calyx and vault somewhat equal in dimensions and together, 

 somewhat wheel-shaped. Eather below the medium size. Calyx 

 broadly truncated at the base, gently expanding to the top of 

 the primary radials and thert abruptly spreading horizontally 

 to the free arms ; more than twice as wide as high ; arm open- 

 ings directed horizontally; plates thick, highly convex on the 

 lower part, but much less so above; sutures moderately dis- 

 tinct; surface graiiular. 



Basals thick and form a low, hexagonal cup, about three times 



as wide as high, with a round, shallow, columnar depression, 



having a concave radiately furrowed bottom for the attachment 



of the column. The base is full twice as wide as the diameter 



-4 a. 



