494 PALAEONTOLOGY OF ILLINOIS. 



SCAPHIOCRLNTJS ^EQUALIS, Hall. 



PL 15, Fig. 6. 

 Scaphiocrinus cequalis, HALL, 1861. Prelim. Descr. Nevr Criiioidea, p. 8. 



Locality and position Keokuk group ; Crawfordsville, Indiana. 



ScAPHiocKonis COKEYI, M. and W. 



PI. 15, Fig. 1. 

 Scaphioerinus Coreyi, MEEK and WORTHEN, 1869. Proceed. Acad. Nat. Sci., Pliila., p. 148. 



BODY of medium size, basin-shaped, or about twice as 

 wide as high, rounded, and distinctly concave below. Base 

 small, and nearly or quite hidden by the column in the 

 concavity of the under side. Subradial pieces compara- 

 tively rather large, curving under to connect with the base, 

 all presenting a general hexagonal outline, excepting two 

 on the anal side, which are heptagonal; they must each, 

 however, have another obscure angle below. First radial 

 pieces about equaling in size the subradials, but propor- 

 tionally wider, being sometimes slightly more than twice 

 as wide as long, all pentagonal in form, the upper side 

 being much the longest, and the lateral margins short. 

 Second radials a little longer than the first, but narrower 

 above, and more or less constricted around the middle; 

 pentagonal in form, the upper angle being rather salient, 

 and each supporting an arm on each of their superior slo- 

 ping sides. First anal piece about one-third as large as 

 one of the subradials, hexagonal in form, and resting be- 

 tween the upper sloping sides of two of the subradials, and 

 partly under one side of one of the first radials on the 

 right ; while it supports another anal piece above, and con- 

 nects with a third on the left, which rests upon the upper 

 truncated side of one of the subradials. 



Arms moderately long, carinated along the middle of 

 the outer side, and after the first division on the second 



