. Bulletin - United States National Museum. Science. 118 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. Genus PH^ENOPORA HalL Phsenopora Hall, Amer. Joum. Sci., ser. 2, vol. 11, 1851, p. 379; Nat. Hist, New York, Pal., vol. 2,1852, p. 46.—Pictet, Traite de Paleontologie, 2d. ed., vol. 4, 1857, p. 169.—Ulrich, Joum. Cincinnati Soc. Nat. Hist., vol. 5, 1882, p. 152.—FoERSTE, Bull. Sci. Lab. Denison Univ., vol. 2,1887, p. 157.— Miller, North. Amer. Geol. and Pal., 1889, p. 314.—Ulrich, Geol. Surv. Illinois, vol. 8, 1890, p. 392; Geol. and Nat. Hist. Sxirv. Minnesota, vol. 3, pt. 1, 1893, p. 173.—Poc
. Bulletin - United States National Museum. Science. 118 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. Genus PH^ENOPORA HalL Phsenopora Hall, Amer. Joum. Sci., ser. 2, vol. 11, 1851, p. 379; Nat. Hist, New York, Pal., vol. 2,1852, p. 46.—Pictet, Traite de Paleontologie, 2d. ed., vol. 4, 1857, p. 169.—Ulrich, Joum. Cincinnati Soc. Nat. Hist., vol. 5, 1882, p. 152.—FoERSTE, Bull. Sci. Lab. Denison Univ., vol. 2,1887, p. 157.— Miller, North. Amer. Geol. and Pal., 1889, p. 314.—Ulrich, Geol. Surv. Illinois, vol. 8, 1890, p. 392; Geol. and Nat. Hist. Sxirv. Minnesota, vol. 3, pt. 1, 1893, p. 173.—PocTA, Syst. Sil. Center Boheme, vol. 8, pt. 1, 1894, p. 8.—Ulrich, Zittel's Textbook of Paleontology (Eng. ed.), 1896, p. 279.— Simpson, Fourteenth Ann. Rep. State Geologist New York for the Year 1894, 1897, p. 541.—NicKLES and Bassler, Bull. 173, U. S. Geol. Surv., 1900, p. 46.—Hennig, Archiv. fur Zool., K. Sven. Stockholm, vol. 2, No. 10, 1905, p. 10.—Bassler, Bull. 292, U. S. Geol. Surv., 1906, p. 55. Like Ptilodictya and Escharopora, except that there are two meso- pores in each interspace between the ends of the apertures. Genotype.—Phsenopora explanata Hall. Silurian (Clinton) of Canada. PHiENOPORA ENSIFORMIS Hall. Text fig. 45. Phsenopora ensiformis Hall, Nat. Hist. New York, Pal., vol. 2,1852, p. 48, pi. 18, figs. 8 a-c.—Nicholson and Hinde, Canadian Journal, new ser., vol. 14, 1874, p. 142.—Nicholson, Pal. Province Ontario, 1875, p. 45, figs. 19, 2, 2a.—Ulrich, Joum. Cincinnati Soc. Nat. Hist., vol. 5, 1882, p. 172.— Foerste, Geol. Surv. Ohio, vol. 7, 1895, p. 598.—Bassler, Bull. 292, U. S. Geol. Surv., 1906, p. 55, pi. 27, figs. 8, 9. Phsenopora cf. ensiformis Wiman, Bull. Geol. Inst. Univ. Upsala, vol. 5, pt. 2, 1902, p. 180, pi. 6, figs. 25-28. Specimens of this species have not occurred in the collections before me, but I have no reason to doubt that Wiman's provisional identification can be accepted as correct. His figure
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