38 Cincinnati Societii of Natural History. 



round and gradually tapering. It is composed of rather large plates, 

 much longer than wide, which are united longitudinally hy pectinated 

 edges, that much resemble the sculpturing in the pectinated rhombs 

 of the Cystidea. 



Locality. — This species is described from specimens in the collec- 

 tion of Prof. A. G. Wetherby, who discovered them in rocks of the age 

 of the Kaskaskia Group, in Pulaski count}^, Kentucky'. 



EUPACHYCRINUS SPARTARIUS, n. Sp. 



\JEXy .—Spartaritis, of or belonging to a broom]. 



Plate VIII., fig, 2, anterior view, showing azj-gos interradials, and 

 one arm springing from a second radial, and two arms from a third 

 radial; fig. 2a, posterior side allowing two arms springing from a sec- 

 ond radial. 



Column round. 



Body. — Body robust, bowl- shaped, deeply sunken for the reception 

 of the column, constricted at the arm bases, and with its strong arms, 

 much resembling in shape the ordinar}- hickory or oak scrubbing- 

 broom. Plates thick, strong, smooth and slightl}' convex. Sutures 

 well defined. 



Basals. — Basals small and deeply sunken in the depression of the 

 under side. Their shape not determined, 



Suh-radials. — Sub-radials large, curving upward upon the outside 

 and into and upward in the concavity of the under side of the bodv. 

 The two superior sloping sides of each of four sub-radials suppoi't 

 first radials, while the one upon the azygos side in addition to joining 

 with two first radials also bears two azygos interradials upon its irreg- 

 ular upper sides. 



First radials. — The first radials are pentagonal, and nearl}' twice 

 as wide as high. The upper strongly truncated side of each, upon 

 which the second radials rest, is the longest; the two inferior sides of 

 each rest upon the superior sloping sides of the sub-radials; and the 

 other two sides join the adjacent first radials, except as to the right 

 and left anterior first radials, which join one side each with an azygos 

 plate. The left anterior one unites a very short side with a sub-ra- 

 dial, and is more irregularly pentagonal than the other first radials. 



Second radials. — The second radials are pentagonal, about two 

 thirds as large as the first radials, and a little more than twice as wide 

 as high. The longest side of each articulates with a first radial, the 

 shortest sides unite with the adjacent second radials except as to the 



