28 POLYZOANS. 



Lyropora divergens ULRICH. 



Lyropora divergens Ulrich, 1890 : Geol. Sur. Illinois, vol. VIII, p. 584, pi. 

 Iviii, figs. 4-4b. 



Horizon and localities. Lower Carboniferous, Kaskaskia 

 limestone : Chester ( Illinois). 



Polypora halliana PROUT. 



Polypora halliana Prout, 1860: Trans. St. Louis Acad. Sci., vol. I, p. 



580. 

 Polypora halliana Prout, 1866: Geol. Sur. Illinois, vol. II, p, 421, pi. 



xxi, figs. 4-4b. 

 Polypora halliana Ulricn, 1890: Geol. Sur. Illinois, vol. VIII, p. 587, pi. 



lix, figs. 5-5c. 



Horizon and localities. vLower Carboniferous, Keokuk 

 limestone : Clark county. 



Polypora maccoyana ULRKH. 



Polypora maccoyana Ulrich, 1890: Geol. Sur Illinois, vol. VIII, p. 588, 

 pi. iix, figs. 3-3d. 



Horizon and localities Lower Carboniferous, Keokuk 

 limestone: Keokuk (Iowa). 



Polypora simulatrix ULRICH. 



Polypora simulatrix Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 589, 

 pi. lix, figs. 4-4b. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: Keokuk ( Iowa). 



Polypora gracilis PROUT. 



Polypora gracilis Prout, 1860: Trans. St. Louis Acad. Sci., vol. I, p. 580. 

 Polypora gracilis Prout, 1866: Geol. Sur. Illinois, vol. II, p. 422, pi. xxi, 



figs. 1-la. 

 Polypora gracilis Ulrich, 1890 : Geol. Sur. Illinois, vol. VIII, p. 590, pi. 



Ixi, figs. 10-10a. 



Horizon and localities Lower Carboniferous, Keokuk 

 limestone : Warsaw ( Illinois ). 



