POLYZOANS. 25 



lively large pores, generally arranged so that there is one at 

 each end of each dissepiment, and another between these oppo- 

 site each side of each fenestrule. ( Meek.) 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures: Kansas City. 



Fenestella elevatipora ULRICH. 



Fenestella elevatipora Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 549, 

 pi. li, tigs. 3-3a. 



Horizon and Localities. Lower Carboniferous, Kaskaskia 

 limestone : Chester (Illinois). 



Hemitrypa hemitrypa (PROUTJ. 



Fenestella hemitrypa Prout, 1859 : Trans. St. Louis Acad. Sci., vol. I, p. 444, 



pi. xvii, tigs. 3-3d. 

 Hemitrypa proutana Ulricb, 1890 : Geol. Sur. Illinois, vol. VII, p. 560, pi. 



Ivii, tigs. 1-lc. 



Harizon and localities Lower Carboniferous, Saint Louis 

 limestone : Barrett station (St. Louis county). 



Hemitrypa aspera ULRICH. 



Hemitrypa aspera Ulrich, 1890: Geol. Sur. Illinois, vol. VI LI, p. 563, pi. 

 Ivii, figs, 4-4f. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Keokuk (Iowa). 



Hemitrypa nodosa ULRICH. 



Hemitrypa nodosa Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 562, pi. 

 Ivii, fig. 3. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: Bentonsport (Iowa). 



Hemitrypa perstriata ULRICH. 



Hemitrypa perstriata Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 564, 

 pi. Ivii, figs. 6-6a. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone: Keokuk (Iowa). 



G 3 



