32 POLYZOANS. 



Ptilopora valida ULRICH 

 Ptilopora valida Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 623, pi. 



Ixv, figs. 5-5c. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: Bentonsport (Iowa). 



Ptilopora cylindracea ULRICH. 



Ptilopora cylindracea Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 623, 

 pi. Ixvi, figs. 2-2b. 

 Horizon and localities. Lower Carboniferous, Keokuk 



limestone : Bentonsport ( Iowa ). 



Ptilopora prouti HALL. 



Ptilopora prouti Hall, 1858 : Geology Iowa, vol. I, p. 653, pi. xxii, figs. 



6a-6c. 

 Ptilopora prouti Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 625, pi. 



Ixv, figs. 3-3c. 



Horizon and localities. Lower Carboniferous, Saint Louis 

 limestone : Barrett station ( Saint Louis county). 



[Septopora cestriensis PROUT. 



Septopora cestriensis Prout, 1859: Trans. St. Louis Acad. Sci., vol. I, p. 



448, pi. xviii, figs. 2-2b. 

 Septopora cestriensis Ulrich, 1890 : Geol. Sur. Illinois, vol. VIII, p. 628, 



pi. Ixiv, figs. 1-lb. 



Horizon and localities. Lower Carboniferous, Kaskaskia 

 limestone : Chester ( Illinois ). 



Septopora biserialis (SWALLOW). 



Plate xxxiv, figs. la-d. 



Synocladia biserialis Swallow, 1858: Trans. St. Louis Acad. Sci., vol.1, 



p. 179. 



Synocladia virgulacea Geinitz, 1866 : Garb, und Dyas in Nebraska, p. 70. 

 Synocladia biserialis Meek, 1872: U. S. Geol. Sur. Nebraska, p. 156, pi. 



vii, figs. 5a-5e. 



Synocladia biserialis Meek, 1874 : Am. Jour. Sci. (3), vol. VII, p. 486. 

 Synocladia biserialis Meek, 1875: Geol. Sur. Ohio. Pal., vol. II, p. 326, 



pi. xx, figs. 5-5 b. 

 Synocladia biserialis White, 1877: U. S. Geog Sur. w. 100 Merid., vol. IV, 



p. 107, pi. vii, figs. 3a-3c. 



