368 AMERICAN FOSSIL BRYOZOA. [bull. 173. 



Polypora rigida Prout. Not recognizable. 



1866. Polypora rigida. Prout, Trans. St. Louis Acad. Sci., II, p. 412. 

 Geological horizon and locality not given. 



Polypora robusta (Hall). 



1883. Fenestella robusta. Hall, Trans. Albany Institute, X, p. 164 (abstract, 



1881, p. 22). 

 1883. Fenestella (Polypora) robusta. Hall, Rep. State Geologist New York for 



the year 1882, pi. xxvii, 4-7, pi. xxx, 1, pi. xxxii, 1-3. 

 1887. Fenestella (Polypora) robusta. Hall and Simpson, Pal. New York, VI, 

 p. 156, pi. xxxiv, 4-7, pi. xxvii, 1-3, pi. xliii, 1. pi. xlvi. 6. 

 Upper Helderberg: Walpole, Ontario. 



Polypora rustica (Hall and Simpson). 



1887. Fenestella (Polypora) rustica. Hall and Simpson, Pal. New York, VI, 

 p. 169, pi. xliii, 10-13. 

 Upper Helderberg: Walpole, Ontario. 



Polypora separata (Hall). 



1883. Fenestella (Polypora) separata. Hall, Rep. State Geologist New York for 



the year 1882, pi. xxxii, 10, 11. 

 1887. Fenestella (Polypora) separata. Hall and Simpson, Pal. New York, VI, 

 p. 166, pi. xxxix, 10, 11. 

 Upper Helderberg: Walpole, Ontario. 



Polypora shumardi Prout. 



1858. Polypora Shumardii. Prout, Trans. St. Louis Acad. Sci., I, p. 271, pi. xvi, 



3-3i. 

 1876-77. Protoretepora (Polypora) Shumardii. De Koninck, Rech. sur les Foss. 



Pal. de la Nouv. Galles du Sud, III, p. 179; 1898, Engl, translation, Mem. 



Geol. Sur. New South Wales, Pal. No. 6, p. 137. 



1885. Polypora shumardi. Hall, Rep. State Geologist New York for the year 



1884, p. 35, pi. i, 5. 

 1890. Polypora shumardi. Ulrich, Geol. Sur. Illinois, VIII, p. 586, pi. Iv, 2-2r/. 

 1883. Fenestella cultellata. Hall, Trans. Albany Institute, X, p. 162 (abstract, 



1881, p. 21). 

 1883. Fenestella (Polypora) cultellata. Hall, Rep. State Geologist New York 



for the year 1882, pi. (36) xxix, .3-22. 



1886. Fenestella (Polypora) cultellata. Hall, Fifth Ann. Rep. State Geologist 



New Y'ork for the year 1885, pi. xli, 9. 



1887. Fenestella (Polypora) cultellata. Hall and Simpson, Pal. New York, VI, 



p. 160, pi. xxxvi, 3-22, pi. xli, 9. 

 Hamilton: Falls of the Ohio. 



Polypora simulatrix Ulrich. 



1890. Polypora simulatrix. Ulrich, Geol. Sur. Illinois, VIII, p. 589, pi. lix, 4-46. 

 1894. Polypora simulatrix. Keyes, Missouri Geol. Sur., V, p. 28. 



Keokuk: Nauvoo, Warsaw, and Henderson County, Illinois; Keokuk and 

 Bentonsport, Iowa. 



Polypora spininodata Ulrich. 



1890. Polypora spininodata. Ulrich, Geol. Sur. Illinois, VIII, p. 594, pi. Ix, 3. 

 1894. Polypora spininodata. Keyes, Missouri Geol. Sur., V, p. 29. 

 Warsaw: Warsaw, Illinois. 



Polypora spinulifera Ulrich. 



1890. Polypora spinulifera. Ulrich, Geol. Sur. Illinois, VIII, p. 598, pi. Ixi, 2, 2a, 

 3, 3a, 4, 4a. 



