18 



in line with the first primary radials, and it is followed by 

 three plates, in the second range, that are cut off from the 

 vault by the tertiary radials. 



The vault is convex and covered with polygonal spiniform 

 plates and bears a very small, central proboscis (?). Two 

 plates appear to be broken out of the center of the summit of 

 our specimen, and if they indicate a proboscis it was quite 

 small, probably not elevated much above the summit of the 

 vault. 



This is a very peculiar species, having a shape somewhat 

 like Eretmocrinus konincki, which is a Baiocrinns, but distin- 

 guished from it by having twenty instead of eighteen arms, 

 four instead of ten plates in the azygous area, by having the 

 azygous area cut off from the vault instead of being connected 

 with it, and by having a much smaller proboscis, more spini- 

 form plates and other peculiarities. 



Found by Mr. C. S. Hodgson, in the Burlington Group, in 

 Adams county, Illinois, and now in the collection of S. A. 

 Miller. 



BATOCRINUS ASPER, n. sp. 



Plate J, Fig. 15, basal view; Fig. 16, azygous side of calyx, part 

 of one of the tertiary radials over the azygous 

 area is broken away. 



Species medium size. Calyx low, broadly truncated and 

 rapidly expanded. Nearly three times as wide as high. Plates 

 very tumid and radiately furrowed. Vault, proboscis and arms 

 unknown. 



Basals form a flat, hexagonal disc with strong, re-entering 

 angles. It is on a level with the lower, flattened face of the 

 first primary radials and bears a slightly concave, radiately 

 lined facet for the attachment of the column, which is about 

 equal to half the diameter of the disc. The columnar canal is 

 of moderate size and cinquefoil. First primary radials a little 

 wider than long, three hexagonal, twoheptagonal, and sculptured 

 pyramidal. Second primary radials quadrangular, about one- 

 half wider than long and sculptured pyramidal. Third primary 

 radials a little larger than the second, pentagonal, axillary, 

 pyramidal, and bear upon each superior sloping side a single 

 secondary radial, which is axillary and bears upon each upper 

 sloping side a single tertiary radial, which gives to each ray 

 four arm openings to the vault. There are, therefore, twenty 

 arms in this species. 



