384 PALEONTOLOGY OF ILLINOIS. 



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making only three arm openings to this ray. The brachial 

 and secondary radial pieces of the anterior ray are broken 

 away in the specimen, but it is probable there were four 

 arm openings in this ray. If so there would be nineteen 

 arm openings (probably normally twenty) in the entire 

 series, and thirty-eight to forty arms, counting two to each 

 opening. 



First anal piece of the same size and form as the first 

 radials, and, like them, swelling out into a transversely 

 elongated node. Above this there are two heptagonal and 

 one apparently hexagonal rather tumid pieces in the second 

 range, and above the latter several other pieces extending 

 up between the arm-bases, so as to connect with a series of 

 pieces forming a thickened protuberance rising even slight- 

 ly higher than the summit of the vault, and pierced by the 

 anal opening, which is situated considerably above the hori- 

 zon of the arm-bases, but still directed laterally. Interra- 

 dial pieces, three to each area, the first being about half as 

 large as the subradials, heptagonal or octagonal, and sup- 

 porting two somewhat elongated, irregularly formed pieces, 

 that are scarcely convex, and connect by their narrow 

 upper ends with vault pieces above. Vault somewhat 

 rounded, with lateral spines very short, or merely having 

 the form of rather prominent conical nodes; central piece 

 somewhat tumid, but not even conical. Arms and column 

 unknown . 



framed in honor of Dr. F. RCEMEK, the founder of the 

 genus Dorycrinus. 



Hight of body to top of vault, 1.40 inches; do. to top of 

 anal protuberance, 1.45 inch; breadth at arm-bases, 1.30 

 inch ; breadth of base, 0.55 inch. 



This species is perhaps more nearly allied to D. Missouriensis, Shu- 

 mard (sp.), than to any other yet known. It will be readily distin- 

 guished, however, by several well marked characters. In the first 

 place, its base is not thickened and expanded as in that species. Again, 

 its vault is not so flattened on top, nor the spines, or tumid pieces over 



