25 



area is very large and contains fifteen plates. The first one 

 is in line with the first primary radials and of the same size. 

 It is followed by three jilates in the second range, five plates 

 in the third range, three in the fourth range and above these 

 there are three plates two of which connect with the i)latos of 

 the vault. Vault convex, comp6.sed of polygonal, convex 

 plates and bears a strong suhcentral jiroboscis. 



This species is distinguished by its general form, absence of 

 radial ridges, and seventeen ambulacral openings to the vault. 

 It will also be distinguished by the number of plates in the 

 azygous area, if that feature is of specific importance, but we 

 have known the number of jilates, in the azygous area, to 

 vary, among specimens, that we have referred to the same 

 species, and, probably, in this species some specimens may 

 show a less number of plates, commencing with the five plates 

 in the third range and concinuing to the vault. We have seen 

 two .specimens besides the one illustrated, but the j^lates in the 

 upper part of the azygous area are either not well preserved 

 or are not to be distinguished from the type. 



Found in the Burlington Group, at Sedalia, Missouri, and 

 now in the collection S. A. Miller. 



BATOCRINUS INCONSUETUS, n. .Sp. 



Plale I, Fig. 25, basal vieiv; Fig. 26, summit view; Fig. 27, 



azijgous side view. 



Species medium or below medium size. Calyx very low and 

 saucer- shaped; heiglit not more than one-fourtli the diameter, 

 and ambulacral openings directed horizontally; slight radial 

 ridges, interradials i)laiu; surface smooth. Column medium 

 size and round. 



Basals form a circular disc that projects below the first 

 primary radials about the thickness of a plate, has a diameter 

 about twice as great as the diameter of the column, and bears 

 a concave, radiately lined depression for the columnar attach- 

 ment. First primary radicals twice as wide as long, three 

 hexagonal and two heptagonal. Second primarj' radials quad- 

 rangular, about three times as wide as long. Tliii-d primary 

 radials a little larger than the second, twice as wide as long, 

 pentagonal, axillary and in each lateral ray sujiport upon each 



