312 PALEONTOLOGY OF ILLINOIS. 



Three anal plates are visible, the first is pentagonal, larger than 

 both the others, nodose like the subradials between which it rests, 

 while its upper angle extends a little above the radial on the right. 

 The second anal rests upon the upper truncated margin of the left 

 posterior subradial, and the third between the first and second anals. 



Column round and rather small for the size of the body. 



This species is related to Lyons' E. quator-decimbrachialis, but dif- 

 fers in its less massive form, and in the number of its arms. 



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



No. 2,443, Illinois State collection. 



EUPACHYCKINUS MoNBOENSis, Worthen. 



PI. XXIX, Fig. 16. 



Eupachycrinus Monroensis, WOETHEN, February, 1882. 

 Bulletin No. 1, of the Illinois State Museum of Natural History, p. 34. 



Body of medium size, low, basin-shaped, composed of massive 

 plates. 



Basals small, triangular above and below, the inner angles bent 

 downward under the column, and the outer ones bent slightly upward 

 between the subradials. 



Subradials protuberant, sub-hemispheric externally, generally 

 pentangular, the one on the anal side a little larger than the others, 

 and truncated on its upper margin for the support of the anal plate. 



Eadials pentagonal, about twice as wide as long, and truncated 

 entirely across their upper margins for the reception of the radial 

 series. 



Anals one, quadrangular, length and width about equal, extending 

 above to a level with the summit of the adjacent radials, and rest- 

 ing below on the truncated upper margin of the right posterior sub- 

 radial. 



Arms and column unknown. 



This species is related to Eupach. formosus, Geol. Surv. 111., Vol. 5, 

 page 549, but differs from that in the proportions of its radial plates 

 and the subglobose character of its subradials. 



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



No. 2,447, Illinois State collection. 



