. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 294 MOLLUSCOIDA. [bac—miT. Fia. 4fi6.—Atiicto- porella new- portensiH. newporteneis, Ulricb, 1883, Jour. Cin. 8oc. Nat. Hist., vol. 6, p. 250, ITtica Slate, ortoni, NicholHon, 1874, (Ghetetes ortoni,) Quar. Jour. Geo. Soc, vol. 30, p. 513, and Ohio Pal., vol. 2, p. 211, Hud. Riv. Gr. schucherti, Ulrich, 1883, Jour. Cin. Soc. Nat. Hist, , p. 251, Hud. Riv. Gr. teuella, Ulrich, 1879, (.\tactopora tenella,) Jour
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 294 MOLLUSCOIDA. [bac—miT. Fia. 4fi6.—Atiicto- porella new- portensiH. newporteneis, Ulricb, 1883, Jour. Cin. 8oc. Nat. Hist., vol. 6, p. 250, ITtica Slate, ortoni, NicholHon, 1874, (Ghetetes ortoni,) Quar. Jour. Geo. Soc, vol. 30, p. 513, and Ohio Pal., vol. 2, p. 211, Hud. Riv. Gr. schucherti, Ulrich, 1883, Jour. Cin. Soc. Nat. Hist, , p. 251, Hud. Riv. Gr. teuella, Ulrich, 1879, (.\tactopora tenella,) Jour, Cin. Soc. Nat. Hist., vol. 2, p. 123, Hud. Riv. Gr. typicalis, Ulrich, 1883, Jour. Cin. Soc. Nat. Hist. vol. 6, p. 248, Utica Slate. Bactropora, Hall, 1887, Pal. N. Y., vol. 6, p. 193. [Ety. haktron, staff; poros, pore.] Ramose, solid; base tapering, striated ; cells tubular, curved oblique from the •center; septa thin, apertures oval, dis- tant near the base, closer above; inter- spaces granulose. Tvpe B. (jranistriata. curvata, Hall, 1887, Pal. N. Y., vol. 6, p. 194, Ham. Gr. granistriata. Hall, 1881, (Trematopora granistriata,) Trans. Alb. Inst., vol. 10, p. 182, and Pal. N. Y., vol. 6, p. 193, Ham. Gr, simplex, Ulrich, (in press,) Geo. Sur. III., vol. 8, pl. 70, Keokuk Gr. Batostoma, Ulricli, 1882, Jour. Cin, Soc. Nat. Hist., vol. 5, p. 154. [Ety. batos, prickly bush; stoma, mouth.] Ramose, base ex- panded ; cell apertures ovate or circu- lar, surrounded by a ring-wall; inter- stitial tubes numerous; spiniform tubuli abundant. Type B. implicatum. fertile, Ulrich, 14th Rep, Geo. Sur. Minn., p. 92 Trenton Gr. imperfectum, Ulrich, (in press,) Geo. Sur. HI., vol. r., pl. 35, Hud. Riv. Gr. implicatum, Nicholson, 1881, (Monticuli- £ora implicata,) Struct, and Affin. of [ontic, p, 147, Hud. Riv. Gr. irrasum, Ulrich, 1886,14th Rep. Geo. Sur. Minn., p. 94, Trenton Gr,. Via. 467.—Batostoma JanieHi. Natural size and magnitled. jamesi, Nicholson, 1874, (Chetetes jamesi,)
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