

POLYZOANS. 29 



Polypora retrosa ULRICH. 



Polypora retrorsa Ulrich, 1890: Geol. Sur. Illinois, vol. VI11, p. 591, pi. 

 lix, figs. 6-Sd. 



Horizon and localities Lower Carboniferous, Keokak 

 limestone: Keokuk (Iowa). 



Polypora radialis ULRICH. 



Polypora radialis Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 591, pi. 

 Ix, figs. 1-ld. 



Horizon and localities Lower Carboniferous. Keokuk 

 limestone: Keokuk (Iowa). 



Polypora spininodata ULRICH. 



Polypora spininodata Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 594, 

 pi. Ix, fig. 3. 



Horizon and localitif <# . Lower Carboniferous, Keokuk 

 limestone : Warsaw ( Illinois ). 



Polypora biseriata? ULRICH. 



Polypora biseriata ? Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 592, 

 pi. Ix, figs. 4-4b. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone: Barrett station (St. Louis county). 



Polypora varsoviensis ULRICH. 



Polypora varsoviensis Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 593, 

 pi. Ix, tigs. 2-2b. 



Horizon and localities. Lower Carboniferous. Saint Louis 

 limestone: Barrett station ( St. Louis county). 



Polypora cestriensis ULRICH. 



Polypora cestriensis Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 549, 

 pi. Iv, figs. 4-4b. 



Horizon and localities. Lower Carboniferous, Kaskaskia 

 limestone : Ste. Genevieve. 



