486 AL.E ONTOLOOY OF ILLINOIS. 



In one of the specimens before us the body measures 1.10 inches from 

 the base to the top of the tirst radials, and about 1.40 inches in breadth. 

 The arms show a length of 4 inches, and are broken at the ends so as 

 to appear to have been, when entire, nearly, one inch longer. They 

 are very straight, nearly cylindrical, and measure 0.22 inch in diameter 

 near the middle, where each arm-piece measures about 0.15 inch in 

 length, and the lateral armlets nearly the same in diameter. 



BARYCBINUS HOVEYI, Hall, sp. 



PI. 13, Fig. 1. 



Cyathocriniis Hoveyi, HAI.L, 1861. Descr. New Grin., Prelim. Notice, p. 5, and Boston Jour. Nat. 

 Hist., Vol. VII. p. 298. 



Locality and position. Crawfordsville, Indiana. Keokuk division of 

 the Lower Carboniferous series. 



BAKYCRINUS MAMMATUS, Worthen, Ms. 



PI. 15, Fig. 4. 



BODY rather below the medium size, cup-shaped or 

 subhemispherical. Base small, slightly protuberant, and 

 truncated for the reception of the first columnar joint ; 

 the basal plates projecting more than half their length be- 

 yond the columnar facet. Subradial pieces about as long 

 as wide, all hexagonal, slightly impressed at their angles, 

 and produced into a small mainniiferous node near the cen- 

 tre of each. Eirst radials pentagonal, wider than long, the 

 one on the anterior side smaller than the others, all slightly 



/ 



convex, but not protuberant ; second radials very short and 

 as wide as the first; third radial, as seen on one ray, about 

 twice as long as the second, and giving off two arms from 

 its upper sloping angles. Anal plate rather small, and 

 quadrangular. Surface of all the body pieces finely ru- 

 gose. 



This species is closely related to B. protuberans, Hall, sp., Geol. Sur- 

 vey of Iowa, Vol. I, part 2, p. 62G, PL 18, Fig. 9, but diners from that 

 in the more delicate protuberances on its subradial pieces, and the non- 

 protuberant character of its first radials. 



Locality and position. Keokuk division of the Lower Carboniferous 

 series. Otter creek, Jersey county, Illinois. 



