176 PALEONTOLOGY OF OHIO. 



the tentacles, and therefore not so tortuous ; the surface of bod}^ and 

 arms is more distinctly striato-granulose, and the column more round, 

 with plates not so unequal. 



Formation and locality: In shales of the Waverly group, Richfield, Summit couijty, 

 Ohio. 



SCAPHIOCRINUS SUBCARINATUS. 



Plate 12, figs. 13, 14. 



Scaphiocrinus subcarmatus ; 17th Rept. on N. Y. State Cab. of Nat. Hist., p. 58, 1864. 

 Extr. published 1863. 



Body small, sub-turbinate, with elongate, slender, branching arms. 

 Basal plates very minute, triangular or sub-pentagonal ; sub-radials 

 small; first radials wider than high; sacond radials larger than the first, 

 unequal in height, longer than wide, and strongly constricted in the 

 middle, obtusely wedge-form above, and supporting an arm on each 

 sloping face. 



Arms bifurcating on the sixth, eighth, or tenth plate, and sometimes 

 on the fourteenth plate from their base, each of the divisions again 

 bifurcating; arm plates supporting jointed angular tentacula. Anal 

 plates unknown. 



Plates of the body angular in the middle, with short, angular ridges 

 running from the center of the sub-radials to the basal plates, and also 

 to the first radial plates. The second radials, as well as the arm plates, 

 are longitudinally angulated or carinate along the middle. The carina- 

 tion follows the enlargement of the arm joint towards the origin of the 

 tentacula, giving a somewhat tortuous direction to the arm. Entire 

 surface minutely granulose, or sometimes striato-granulose. 



Column round or obscurely pentangular, and composed of very unequal 

 joints. 



This species closely resembles Scaphwcrinus carinatus, of the Burling- 

 ton limestone, but differs in the bifurcation of the arms, and more essen- 

 tiallj'- in having but two radial plates in the series, while that speciea 

 has three. 



Formation and locality : In shales of the Waverly sandstone group, at Richfield, 

 Summit county, Ohio. 



