24 



Vault depressed convex with a very small, short, subcentral 

 proboscis. It is cohered with irregular, polygonal, gently convex 

 plates. The proboscis seems to be complete, except the covering, 

 in our specimen, though it is possible small plates may have 

 been broken from the top of it. It is evident it could not have 

 been much higher. 



This species agrees with Batocrinus in the plates of the calyx, 

 but differs in all other respects from all described species. The 

 arm openings and proboscis are peculiar and different from 

 those in any other known species. 



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

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



BATOCRINUS LAETUS, n. Sp. 



Plate T 7 , Fig. 10, view opposite the azygous area; Fig. 11, 

 azygous side view; Fig. 12, summit of same specimen. 



Body medium size. Calyx obconoidal, truncated at the base, 

 a little less than twice as wide as high, arm openings directed 

 horizontally; plates thick, very highly convex, the convexity 

 generally angular; sutures distinct; surface granular. 



Basals moderately thick, and form a low, hexagonal cup, twice 

 as wide as high, with a round deep columnar depression, having 

 a concave, radially furrowed bottom, for the attachment of the 

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

 column. The basal plates stand upright; they are flattened in 

 the central part, and beveled toward the sutures, which makes 

 the cup hexagonal. It will be observed, that the basals form a 

 cup like that of B. aspratilis, except the plates are somewhat 

 thinner. First radials longer than the basals, but somewhat 

 shorter and of unequal size ; they are, however, wider than long, 

 three hexagonal and two heptagonal, with the superior sides 

 slightly arcuate. Each one is transversely, highly convex, the 

 ' elevation being obtusely angular. Second radials quadrangular, 

 and about three times as wide as high. Third radials pentagonal, 

 twice as wide as high, convex in the central part, axillary, and 

 bearing upon each upper sloping side two secondary radials. 

 The second secondary radials are only a little larger than the 

 first, axillary, and bear upon each upper sloping side two ter- 

 tiary radials. The proximate ray on each side of the azygous 



