984 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Plasmopora petallformis — Continued. 



Silurian: England (Wenlock); Drummonds Island, Lake Huron (Niagaran); Two 

 miles west of Chicotte River, Anticosti f Anticostian — Jupiter River — Chi- 

 cotte); Baie des Chaleurs, Quebec. 



Plasmopora puella Lindstrom. See Lyellia puella. 



PLATTAXUM (Davis) Foerste. Genotype: Pachypora frondosa Nicholson. 



Platyaxum Davis, Kentucky Fossil Corals, Geol. Surv. Kentucky, pt. 2, 1885, 

 expl. pi. 60.— Foerste, Bull. Sci. Denison Univ., 14, 1909, p. 105. 



Platyaxum pegramense (Foerste). 



Pachypora (Platyaxum) pegramensis Foerste, Bull. Sci. Lab. Denison Univ., 14, 



1909, p. 103, pi. 3, fig. 57. 

 Alveolites pegramensis Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 104. 

 Niagaran (Brownsport): Two miles west of Pegram, Tennessee. 



Platyaxum planostiolatum (Foerste). 



Pachypora (Platyaxum) planostiolata Foerste, Bull. Sci. Lab. Denison Univ., 14, 



1909, p. 106, pi. 3, fig. 55. 

 Niagaran (Brownsport): Two miles west of Pegram, Tennessee. 



Platyaxum platys Foerste. 



Platyaxum platys Foerste, Jour. Geol., 11, 1903, p. 713. 



Pachypora (Platyaxum) platys Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, 



p. 104, pi. 1, fig. 16a-c. 

 Niagaran (Brownsport): Brownsport Furnace and near Linden, Tennessee. 



PLATTCERAS Conrad. Genotype: P. dumosum Conrad. 



Platyceras Conrad, 4th Ann. Rep. New York Geol. Surv., 1840, p. 205. — Wood- 

 ward, Man. Mollusca, pt. 1, 1851, p. 153.— Hall, 12th Rep. New York State 

 Cab. Nat. Hist., 1859, pp. 15, 16; Pal. New York, 3, 1859, pp. 308, 309, p. 468.— 

 Meek and Worthen, Proc. Acad. Nat. Sci. Philadelphia, 1866, pp. 262, 263; 

 Geol. Surv. Illinois, 3, 1868, pp. 384, 387; Proc. Acad. Nat. Sci. Philadelphia, 

 1868, p. 331; Geol. Surv. Illinois, 5, 1873, p. 334.— Nicholson, Rep. Pal. 

 Prov. Ontario, pt. 1, 1874, p. 115. — Wetherby, Jour. Cincinnati Soc. Nat. 

 Hist., 2, 1879, p. 6, footnote. — Lindstrom, Kongl. Sven. Vet.-Akad. Handl., 

 19, No. 6, 1881, p. 59.— Zittel, Handb. Pal., 2, 1882, p. 217.— (Ehlert, Bull. 

 Soc. Geol. France, 3d ser., 11, 1883, p. 603. — Koninck, Ann. d. Mus., Royal 

 d'Hist. Nat. de Belgique, 8, 1883, p. 169.— Walcott, Mon. U. S. Geol. Surv., 

 8, 1884, p. 182.— Keyes, Amer. Nat., 22, 1888, p. 925; Amer. Jour. Sci., 3d 

 eer., 36, 1888, p. 269; Proc. Amer. Phil. Soc, 25, 1888, p. 231.— Nettelroth, 

 Kentucky Foss. Shells, Geol. Surv. Kentucky, 1889, p. 160.— Miller, N. A. 

 Geol. Pal., 1889, p. 415.— Keyes, Amer. Geol., 6, 1890, pp. 6-9; Proc. Iowa 

 Acad. Sci., 1, pt. 2, 1892, p. 24; Amer. Geol., 10, 1892, p. 273.— Freeh, Zeits. 

 d. d. geol. Gesell., 46, 1894, p. 469.— Koken, Die Leitfossilien, Leipzig, 1896, 

 pp. 106, 128, 133, fig. 115.— Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 

 1897, p. 1068.— Koken, Bull, de l'Acad. Imp. Sci. St. Petersburg, 7, 1897, 

 p. 195.— Grabau, Bull. Buffalo Soc. Nat. Sci., 6, 1899, p. 271.— Girty, Mon. 

 U. S. Geol. Surv., 32, pt. 2, 1899, p. 574, pi. 66, figs. 12a-c, lla-d.— Pilsbry, 

 Zittel-Eastman Textb. Pal., 1, 1900, p. 461.— Grabau, Bull. Buffalo Soc. Nat. 

 Sci., 7, 1901, p. 211; Bull. New York State Mus., 45, 1901, p. 211.— Girty, 

 U. S. Geol. Surv., Prof. Pap. 16, 1903, p. 310.— Grabau and Shimer, N. A. 

 Index Fossils, 1, 1909, p. 680.— Dall, Zittel-Eastman Textb. Pal., 2d ed., 

 1913, p. 54. 



