FOSSILS OF THE COAL ME A SI RES. 561 



ERISOCRIM S. 

 ERISOCRIXUS TTPUS, M. and W. 



PI. 24, Fig. 6. 



Erisocrinv* bipns. MEEK and \V~ORTHEX, 1865. Amer. Jour. Sci., new series, VoL XXXIX, p. 174 ; 

 also. Report GteoL Survey of 111., Vol. II, p. 317, Fig. 34, *, b, c. 



Locality and position Eoof shales of Xo. 8 coal, Springfield, 111. 



Genus POTERIOCRIXITES. 

 POTEEIOCRIXITES MACOUPiXEXSis, Worthen Al<. 



PL 24, Fig. 3. 



BODY obcoiiical, tapering gradually from the top of the 

 lirst radials to its connection with the column; composed 

 of smooth, slightly rounded plates, hase scarcely larger 

 than the columnar facet below, gradually widening 

 upward, and composed of nearly equal pentagonal pieces. 

 Subradials large, about as high as wide, two heptagonal 

 and three hexagonal. First radials wider than high, pen- 

 tagonal, and straight across their upper margins, for the 

 reception of the second radials. First anal plate about half 

 the size of the subradials; second anal about half as large 

 a< the lirst. and both pentagonal. 



Arms and column unknown. 



Pnxition and locality Upper Coal Measures ; Macoupiu county, Illi- 

 nois. 



Subgenus SCAPHIOCBIXUS. 



SCAPHIOCKIXUS ? HEMISPHERICUS, SllUni. Sp. 



PL 24, Fig. 5. 



'ocnniw ktmigphericiu, SHCMARD. 15^. Trans. St. Louis Acad. Sc., Vol. I, p. 221. 

 Seaphiocrinug t hemiepherieut. MEEK, 1S72. Final Report on Js'eb., p. 147 ; pi. 5. fig. 1, and pi. 7, fig. 1. 



Position and locality Upper Coal Measures j Springfield and La 

 S;ille, Illinois. 





