23G PALEONTOLOGY OF ILLINOIS. 



acquainted, but is much more robust, while the truncate upper sides of its first 

 radials are not near so s'op'ng outwavda, nor so flattened. The ridges on its 

 subradial and first radial pieces are less angular, and the surface of these plates 

 is otherwise smoother than in C. sculptilis, which holds a lower geological 

 position. 



Locality and position : same as preceding. 



Ctathocrinus saffordi, M. and W. 



PI. 17, Fig. 5 a, 5 5. 



Cyathocrinus Saffordi, Meek and Worthen, Sept., 1860. Proceed. Acad. Nat. Sci., 

 Ptfilad., p. 371. 



Body subglobose, wider than high, the broadest part being 

 below the middle, unsymmetrical (at least in our specimen), 

 the ventral side being much more gibbous than the other; com- 

 posed of thin, smooth, or finely granulose plates, connected by 

 linear, slightly carinated sutures. Base irregularly pentagonal, 

 flat, or so slightly convex as to be scarcely visible ii a side 

 view, consisting (in the specimen before us) of unequal plates, 

 those on the anal side being larger than the others, slightly 

 protuberant at the columnar facet. Subradial plates rather 

 large, unequal, wider than high, four of them hexagonal (the 

 inferior angle being nearly obsolete), and one on the anal side 

 — which is considerably larger than the others — irregularly 

 heptagonal. First radial plates a little longer than the subra- 

 dials, somewhat unequal, hexagonal, generally wider than 

 high, and narrowing upwards from the inferior lateral angles; 

 bordered above by a slender, slightly reflexed rim ; sinus in 

 the superior edge for the reception of the second radial pieces, 

 small. Anal plate small, about as wide as high, quadrangular, 

 and like the first radials, provided with a slightly reilexed rim 

 above; not projecting above the margin of the radial plates 

 on each side of it. Height to summit of first radials 0.50 

 inch; greatest breadth, 0.70 inch. 



