250 Cincinnati Society of Natural History. 



case of the kind which I have met up to this time, the othei* being the 

 Glyptocrinns nealii of the Cincinnati Group, Lower Silurian. The 

 specimens illustrated were collected b}' me at the locality above 

 named, and are a part of my cabinet of subcarboniferous crinoids. 



Synbathocrinus gkanuliperus, nov. sp. 



Plate XVI., fig. 3, azygos ; 3a, opposite view. 



Basals — Three, pentagonal, wider than high, the upper faces being 

 slightly concave for the reception of the lower convex surfaces of the 

 first radials. They are so approximated centrally as to leave a very 

 small depression, if any, for the reception of the column. 



Badials — Five, quadrangular, higher than wide, with the upper 

 and lower articulating surfaces nearly parallel, while the later- 

 al surfaces gradually diverge as these plates widen upwards. They 

 are also thickened at this extremity, and as the proximal ends 

 of the next series are also widened and thickened' at the same place, 

 the body of the crinoid at the line of junction of the two radial series 

 has its peripher}' largely increased. 



Brachials — Five, resembling the radials reversed, though searcel}^ as 

 high, wider below, narrower and thinner above. Upon these plates rest 

 the five arms. 



Anals — Two visible, the lower apparentl}" quadrangular or obscurel}' 

 so, the other quadrangular, and much higher than wide. Nothing 

 further can be determined either in reference to these plates, or the 

 ventral sac of which the}' are the lower extremity-. 



Body — This is somewhat pentagonal in outline, very short when com- 

 pared with the length of the arms, and tapers gradually above and 

 below the junction of the first and second radials. 



Arms — Five, slender, tapering very gi'adually upward, and each com- 

 posed of about thirt}'' quite regularly quadrangular plates, higher than 

 wide, convex exteriorl}', deeply and narrowly grooved by the ambu- 

 lacral furrows on the inner faces, and showing no evidences of the at- 

 tachment of pinnuliie. 



Column. — This is round, and composed of alternately thicker and 

 thinner plates. 



Remarks. — The body and arms of this fine species, in the two speci- 

 mens studied, are ornamented with small, irregularly disposed tuber- 

 cles or granulations, which arc smaller and more thickly studded 

 toward the distal portions of the arms. The specimens described were 

 found b}' Mr. E. O. Ulrich, in rocks of the age of the Kinderhook 



