21 



Vault elevated over the arm openings, convex and having, 

 comparatively, a small subcentral proboscis. It is composed of 

 very irregular, polygonal, tumid plates, without any apparent 

 order as to size or arrangement. The proboscis is broken off 

 so its length is not ascertained. 



This species bears most resemblance to B. cbristyi, from which 

 it is distinguished by the longer form of the calyx, longer 

 basals, longer and more convex first radials, shorter second and 

 third radials (if this species possesses the second quadrangular 

 plate) more elevated vault over the arm openings, less convex 

 beyond, smaller proboscis, and more tumid plates. Indeed ver3' 

 slight observation will distinguish the two species. 



Found by the laborious naturalist and indefatigable collector, 

 R. A. Blair, of Sedalia, Missouri, in the upper part of the Bur- 

 lington Group near Blackwater Station, a few miles west of 

 Booneville, in that State, and with his usual generosity presented 

 to one of the authors — S. A. Miller. 



BATOCRINUS ASPRATlL :S, U. sp. 



Plate V, F'ig. 4, azygous view; Fig. -1, lateral view; Fig. 0, 



summit view. 



Body of our specimen unsymmetrical, one side larger than the 

 other, which may or may not be abnormal. The species is of 

 medium size and the vault is nearly as large as the calj'x. 

 Calyx broadly truncated at the base and very rapidly expand- 

 ing in the upper part; about half as wide as high; arm open- 

 ings directed horizontally; plates highly convex; sutures distinct; 

 surface granular. 



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

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

 a concave, i adiately furrowed bottom, for the attachment of the 

 column. The base is about two and a half times as wide as the 

 diameter of the column. The basal plates stand nearly upright; 

 they are flattened, in the central part, and beveled towai'd the 

 sutures, which makes the cup hexagonal. First radials smaller 

 than the basals, of unequal size, and about twice as wide as 

 high, three hexagonal, two heptagonal, and directed at an angle 

 of about thirty degrees from the basals. Each one is trans- 

 versely, highly conyex, the elevation being obtusely angular. 



