314 PALEONTOLOGY OF ILLINOIS. 



Radial s longer than wide, lateral borders nearly straight, slightly 

 contracted at their summits, the articulating scar for the reception 

 of the brachial series occupying about one third of the width of 

 their upper margins. 



Brachial plates small, apparently two in number, the second one 

 being the longest, and supporting on its upper sloping sides the first 

 arm plates. 



Arms two to each ray, composed of short, rounded joints, which 

 give off strong pinnules from their inner borders. Anal side and 

 column unknown. The surfaces of the body plates are marked by 

 obscure longitudinal ridges that will serve to distinguish the species 

 from any other heretofore described from this horizon. 



Position and locality: Upper part of the Keokuk limestone, Hamil- 

 ton, 111. 



No. 14 of Mr. L. A. Cox's collection. 



TALAROCKLNTTS, Wachs. & Spr. 

 TALABOCEINUS OVATUS, Worthen. 



PI. XXIX, Fig. 11. 



Talarocrinus ovatus, WOETHEN, Feb., 1882. 

 Bulletin No 1, of the Illinois State Museum of Natural History, p. 3C. 



Body above the medium size, ovate in general outline, lobate as 

 viewed, from above or below. 



Basals about half as high as wide, impressed below, and pentag- 

 onal above, with a slight depression at their lateral borders. 



First radials about one-third longer than wide, the anterior one 

 pentangular, the others quadrangular, and all protuberant. The 

 succeeding radials not visible. 



The first anal is as large or a little larger than the first radials, 

 heptagonal, having four distinct angles above and three below. It 

 is succeeded by three small anals, the central one of which is pen- 

 tagonal, and rests on the truncated summit of the first anal, while 

 the other two, the form of which can not be clearly seen, rest upon 

 its upper lateral angles. Above this there is one or two series of 

 very small plates surrounding the anal opening. 



The vault is composed of very small, smooth plates, except the 

 central one, which is larger, and produced into a pointed spine. In 

 one of our specimens there is a spine-bearing plate, between the arm 



