308 PALAEONTOLOGY OF ILLINOIS. 



long; the second, third and fourth, quadrangular, and nearly as 

 wide as the first, their width being equal to about once and a half 

 their length. The fifth radial is pentagonal, and supports upon its 

 upper sloping sides the divisions of the rays. The arms, beyond 

 the first division, throw off armlets at intervals of five or six plates 

 to their extremities on the only rays that are preserved in the speci- 

 mens obtained. 



None of the specimens show more than two or three inter-radial 

 plates. The first of these is hexagonal, about as wide as long, and 

 this was apparently succeeded by a series of three smaller plates 

 that are but partially preserved. Anal plates unknown. 



Column round, largest at its junction with the body, and com- 

 posed of very thin, even joints. 



Position and locality: Chester limestone, Monroe county, 111. 



No. 2,442, Illinois State collection. 



GENUS TAXOCRINUS, Phillips. 



TAIOCRINUS FLETCHEBI, Worthen. 

 PI. xxx, rig. a. 



Taxocrinus Fletcheri, WORTHEN, February, 1882. 



Bulletin of the Illinois State Museum of Natural History, p. 31. 



Body, with arms complete, ovate in outline, lobate, composed of 

 thick, massive plates. Basals small, and concealed by the column. 

 Subradials extending nearly half their length beyond the columnar 

 facet, forming by themselves a low, pentagonal cup. Primary radi- 

 als three in each ray, gradually widening from the first to the third, 

 which is an axillary plate, giving support to the first plates of the 

 second series. Secondary radials three, more than half as wide as 

 the first, the last one supporting the first plates in the Tertiary series. 

 Above the secondary series some of the arms, if not all, divide 

 again on the fifth plate, above which they become quite slender. 



On the anal side of the specimen two series of plates are pre- 

 served. The first one is hexagonal in form, and rests between the 

 upper angles of two of the subradials. In the next series there are 

 three plates, each about half as large as the first, the middle one 

 resting directly upon it, and the others resting between the upper 

 angles of the first auals and the adjacent first radials. Above this 



