392 PROCEEDINGS OF THE ACADEMY OF 



angle; columnar facet very small, and slightly projecting. Subradial plates 

 rather large, wider than high, four of them hexagonal (the inferior angle being 

 very obtuse or nearly obsolete), and one on the anal side, which is considerably 

 larger than the others, irregularly heptagonal. First radial plates about the 

 size of the subradials, somewhat unequal, hexagonal, generally wider than 

 long, and tapering upward 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 piece, small. Anal plate small, about as wide as high, 

 quadrangular, and, like the first radials, provided with a marginal rim ; not pro- 

 jecting above the radial plates on each side of it. 



Height to summit of first radials, 0-44 inch; greatest breadth, 0-67 inch ; 

 breadth of base, 0-45 inch. 



Dedicated to Prof. Saffbrd, State Geologist of Tennessee. 

 Locality and position. White's creek, Tennessee. Keokuk Limestone. 

 Cyathocrinus ? Sangamonensis. Body beneath the summit of the first radial 

 pieces semi-ovate, composed of thick, moderately convex, smooth plates, which 

 are joined by strongly defined punctured sutures. Base pentagonal, equalling 

 about half the breadth of the body, convex, and formed of equal pentagonal 

 pieces, which are a little wider than long; columnar facet round, deep, and 

 about one-third as wide as the base. Subradial pieces large, as wide as long; 

 three of them hexagonal, with their superior sloping sides slightly longer than 

 their lateral margins, which are longer than the basal edges ; and the other 

 two heptagonal, with unequal sides. First radials wider and shorter than the 

 subradial pieces, about twice as wide as high, pentagonal, and of nearly equal 

 size and form ; their upper sides being horizontally truncate, straight or slightly 

 concave, and considerably longer than either of the basal sides, which are 

 rnurh longer than the vertical lateral edges. 



The anal plate is comparatively small, longer than wide, and projects some- 

 what above the summit of the first radials. It seems to be irregularly hepta- 

 gonal or octagonal, but the exact form of its upper extremity is not distinctly 

 seen in our specimen. Its base rests upon the short upper truncated extremity 

 of one of the irregular heptagonal subradial plates, while on either side it con- 

 nects with the first radials, and is supported on its right inferior sloping mar- 

 gin by a large oblong quadrangular subanal piece. This subanal plate is 

 larger than the anal piece, and rests upon the superior sloping edges of the two 

 heptagonal subradials, while its upper oblique side supports one of the inferior 

 sloping sides of the first radial plates, on the right of the first anal piece. 

 Arms, summit, and column unknown. 



Height from the base to top of first radial pieces, 0-94 inch ; breadth about 

 1-25 inches ; diameter of columnar facet, 0-24 inch ; breadth of base, 0-64 inch 

 height and breadth of subradials, 0.60 inch ; height of first radials, 0-36 to 

 0-40 inch ; breadth of do. about 0*68 inch. 



Locality and position. Sugar creek, Sangamon county, Illinois, Upper Coal 

 Measures. 



Cyathocrinus? crassus. Body below the summit of the first radial plates 

 depressed, or basin-shaped, about twice as wide as high, rounded or subtrun- 

 cate below, and composed of smooth, strong, thick, slightly convex plates 

 which are joined by well defined, punctate sutures. Base very small, or about 

 one-fourth the breadth of the body, pentagonal, concave, and apparently nearly 

 hidden by the column. Subradial plates a little wider than high, extending at 

 first nearly horizontally outwards from the base, after which they curve 

 obliquely upwards, four of them hexagonal, and one on the anal side hepta- 

 gonal; the angle at the middle of the base of each being but slightly salient. 

 First radial plates larger than the subradials, nearly twice as wide as high 

 truncated horizontally, and nearly or quite straight on the upper side, which 

 is longer than the inferior sloping edges ; four of them pentagonal, and 'one on 

 the left of the anal piece hexagonal. 



[Sept. 



