. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. ;{2() [ Kill. HiniMtralis, Hall, 1887, Pal. N. Y., vol. (>, p. 174, Up. Held. Gr. Ptilotryi'a, Ulrich, (in press,) Geo. Sur. III., vol. 8, p. 393. [Ktj^. 'pliUm., feather; tnifja, an opening.] Bifoliate, forming large ramose expansions. Zo(Bcial tubes and apertures very oblique; at the upper extremity of the acutely ovatii af>erture there is a small ceil which is beet seen in tangential se
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. ;{2() [ Kill. HiniMtralis, Hall, 1887, Pal. N. Y., vol. (>, p. 174, Up. Held. Gr. Ptilotryi'a, Ulrich, (in press,) Geo. Sur. III., vol. 8, p. 393. [Ktj^. 'pliUm., feather; tnifja, an opening.] Bifoliate, forming large ramose expansions. Zo(Bcial tubes and apertures very oblique; at the upper extremity of the acutely ovatii af>erture there is a small ceil which is beet seen in tangential sec- tions ; surface with irregular, longitu- dinally chanr-eled spots. Type ". ob- li(|uata. obliquata, Ulrich, (in press,) Geo. Sur. III., vol. 8, pi. 30, Hud. Riv. Gr. Kamipora, Toula, 1875, Permo-Carbon- Fossilien von der West Kiiste von Spitzbergen, p. 6. [Ety. ramus, branch; poros, pore.] Staff in cross section, rounded, rhombic, with keel on both sides; branches in pairs one on each side, and these connected in like man- ner by rays, upward and downward; pores on one side, on each side of the keel. Type R. ho'*hstetteri. hcchstetteri, Toula, 18' i, Permo-Carbon- Fossilien von der West Kiiste von Spitzbergen, p. 6, Carboniferous. Rbi'Taria, Rolle, 1851, Leonhard & Bronn, Neues Jahrb., p. 810. [Ety. repto, to creep.] Zoarium parasitic, procum- bent, attached its entire length; con- sisting of a racliis, from which pro- ceed laterally, at regular intervals, cylindrical cell tubes, and at irregular distances tubes which have the same manner of growth as the primary rachis; cell-tubes turn abruptly outward at their distal extremities, and open in an aperture parallel with the axis of the branch. Type P. stolonifera. nodata. Hall, 1884, (Pcilionella nodata,. Rep. St. Geol., p. 57, Ham. Gr. penniformis, Hall, 1884, (Ptilionella penni- formis,) Rep. St. Geol., p. 56, Ham. Gr. stolonifera, Rolle, 1851, Leonhard & Bronn, Neues Jahrb., p. 810, Ham. Gr. Retepora, Lamar
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