52t> PALEONTOLOGY OF ILLINOIS. 



Genus OYATHOXONIA, Michelin. 



Ctathoxonia distorta, Worthen. 



PI. 32, Kg. 4. 



■Coral small, cylindrical, more or less distorted and gradually tapering 

 at the lower extremity, where, in some examples, it shows the bases of 

 several small spines or rootlets; surface showing numerous distinct 

 longitudinal stria?, crossed by rather indistinct wrinkles of growth. 

 Calice circular, rather deep, with a small columella visible in one of our 

 specimens. Septa 22 to 24 or more. 



Position and locality : Cumberland county, Illinois. Bare in the 

 limestone over coal No. 16, associated with Fusulina cylindrica, etc. 



Genus OH^TETES, Fischer. 



Ch^etetes ? carbonaria, Worthen. 



PI. 32, Fig. 5. 



Coral cylindrical or ramose, calices rather unequally developed, coral- 

 lites small and radiating from the center with closely arranged tabulw. 



We refer this form to the genus Chcetetes with hesitation in view of its 

 rather undefined characters, but as the species illustrated is a well 

 marked form in the Coal Measures, it seems desirable that it should 

 have some designation. 



Position and locality : St. Clair county, Illinois ; in the calcareous 

 shales over the Belleville coal. 



Poteriocrintjs LaS^llensis, Worthen. 



PI. 32, Fig. 3. 



Body below the base of the arms obcouic, very gradually tapering to 

 the middle of the subradials and more rapidly below; base small, trun- 

 cated for the reception of the columnar facet, and about twice as wide 

 as high ; subradials of moderate size, length and breadth nearly equal, 

 three hexagonal and two heptagonal ; first radials about once and a 

 half as wide as high, pentagonal ; first anal plate smaller than the sub- 

 radials between the upper angles of which it rests, pentagonal; second 

 anal plate longer than wide, hexagonal, and resting on the upper trun- 

 cated margin of a subradial; third anal plate rather wider than long, 

 hexagonal or heptagonal, and resting on the upper truncated margin of 



