108 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Batostoina canadense (Foord). 



Amplexopora Canadensis Foord, Contr. Micro-Pal. Cambro-Sil., 1883, p. 17, pi. 4, 



figs. 2-2d. 



Batostoma Canadensis Ulrich, Geol. Minnesota, 3, 1893, p. 317. 

 Mohawkian: St. Joseph Island, Lake Huron (Black Paver); Joliette, Quebec 

 (?Trenton). 



Batostoma? decipiens Ulrich. 



Batostoma? decipiens Ulrich, Geol. Minnesota, 3, 1893, p. 298, pi. 27, figs. 16-19. 

 Black River (Decorah): Minneapolis, Minnesota. 

 Holotype.C&t. No. 43511, U.S.N.M. 



Batostoina fertile Ulrich. 



Batostoma fertilis Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Siirv. Minnesota, 1886, 

 p. 92; Geol. Minnesota, 3, 1893, p. 290, pi. 25, figs. 1-11; Zittel's Textb. Pal. 

 (Engl. ed.), 1896, p. 275, fig. 459A. Sardeson, Jour. Geol., 9, 1901, p. 12. 

 Grabati and Shimer, N. A. Index Fossils, 1, 1907, p. 136, fig. 188k, 1901. 

 Bassler, Bull. U. S. Nat. Mus., 77, 1911, pp. 274, 275, fig. 163. 



Black River (Decorah): Minneapolis, Minnesota, and vicinity. 



Ordovician (Echinospherites limestone) : Near Reval, Esthonia, Russia. 



Cotypes.-V&t. No. 43505, U.S.N.M. 



Batostoma fertile circulare Ulrich. 



Batostoma fertile var. circulare Ulrich, Geol. Minnesota, 3, 1893, p. 291, pi. 25, 



figs. 8, 9 Bassler, Bull. U. S. Nat. Mus., 77, 1911, pp. 275, 276, fig. 164; 



Zittel-Eastman Textb. Pal., 1913, p. 338, fig. 492b. 



Batostoma fertile Ulrich, Zittel's Textb. Pal. (Eng. ed.), 1896, p. 275, fig. 459B. 

 Black River (Decorah): Minneapolis, Minnesota, and vicinity. 

 Ordovician (Echinosphserites limestone): Near Reval, Esthonia, Russia. 

 Holotype.Cat. No. 43506, U.S.N.M. 



Batostoma humile Ulrich. 



Batostoma humile Ulrich, Geol. Minnesota, 3, 1893, p. 294, pi. 25, figs. 29-36. 

 Trenton (Prosser): St. Paul and Cannon Falls, Minnesota; Decorah, Iowa. 

 Cotypes.G&t. No. 43509, U.S.N.M. 



BATOSTOMA IMPERFECTUM Ulrich. See Hemiphragma imperfectum. 



Batostoma implicatum (Nicholson). 



Chaetetes implicata Ulrich, Cat.Foss. Cincinnati Group, 1880, p. 12 (not defined). 

 Monticulipora (Heterotrypa) implicata Nicholson, Genus Monticulipora, 1881, p. 



147, pi. 2, figs. 7, 7e. 



Monticulipora implicatum J. F. James, Jour. Cincinnati Soc. Hist., 16, 1894, p. 198 

 Batostoma implicatum Ulrich, ibid., 5, 1882, p. 256; 7, 1883, p. 83. Nickles and 



Bassler, Bull. U. S. Geol. Surv., 173, 1900, p. 178. Nickles, Bull. Kentucky 



Geol. Surv., 5, 1905, p. 48, pi. 2, fig. 6. Cumings, 32d Ann. Rep. Dep. Geol. 



Nat. Res. Indiana, 1908, p. 774, pi. 7, fig. 7; pi. 8, fig. 2. 

 Alecto nexilis James, Intr. Cat. Foss. Cincinnati Group, 1875, p. 3. Bassler, 



Proc. U. S. Nat. Mus., 30, 1906, p. 10. 

 Ceramopora? irregularis James, Paleontologist, No. 1, 1878, p. 5 (part). Bassler, 



Proc. U. S. Nat. Mus., 30, 1906, p. 26. 

 Eden: Cincinnati, Ohio, and vicinity. 



BATOSTOMA IRRASA Ulrich. See Hemiphragma irrasum. 



Batostoma jamesi (Nicholson). 



Chaetetes Jamesi Nicholson, Quart. Jour. Geol. Soc. London, 30, 1874, p. 506, pi. 

 29, figs. 10, lOb; Pal. Ohio, 2, 1875, p. 200, pi. 21, figs. 11, lla; Ann Mag. 

 Nat. Hist., 4th. ser., 18, 1876, p. 89. 



