306 PALEONTOLOGY OF ILLINOIS. 



GENUS PLATYCRINTJS, Miller. 

 PLA.TYCRINUS MONROENSIS, Worthen. 



PI. XXX. Fig. 9. 



Plalycrinus Monroensis, WOBTHEN, February, 1882. 

 Bulletin No. 1, of the Illinois State Museum of Natural History, p. 30. 



Body small, cup-shaped, about once and a half as wide as high. 

 Basal plates extending about one-half their length beyond the first 

 columnar joints, the lower margin projecting so as to form a nar- 

 row rim to the base. Eadials wider than high, the articulating 

 scar occupying only about one-third to one-half of their entire 

 width. 



Brachials single, narrow, subtriangular, sharply cuneate above, 

 and supporting on their upper sides the first arm plates. On the 

 two rays visible in the specimen under examination, the arms, 

 after their first division on the brachials, divide again, both divisions 

 once on the second plate above the brachials, and one of them the 

 second time on the second arm plate above, giving five arms to 

 each ray. 



Arms composed at first of long, rounded joints, that are some- 

 what zigzag and projecting on their margins, where they give off 

 strong pinnules, but towards their extremities they are composed of 

 short, triangular pieces that also sustain pinnules on their longest 

 margins. Pinnules quite stout, their diameter being about equal to 

 one-third of the width of the plates to which they are attached. 



Position and localities: St. Louis limestone, Monroe county 111., and 

 Blount county, Tenn. 



No. 2,461, Illinois State collection. 



GENUS ERETMOCRINUS, L. and C. 

 ERETMOCBINUS VARSOVIENSIS, Worthen. 



PI. XXVIII, Fig. 14. 



Eretmocrinus Varsoviensis, WOKTHEN, February, 1882. 



Bulletin No. 1, of the Illinois State Museum of Natural History, p. 30. 



Body small and turbinate below the base of the arms. Basals 

 short, slightly projecting on their lower margins, forming a well 

 defined rim around the base, 



