. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. TRANSACTIONS OF SECTION C. 725 teeth, sonimvlinl like a shoe-last in forin, which played upon stronp:, flattened, bony plates tliat covered the roof of the mouth. These, like Diploijnathm, are from the |[m'0)i .-hale of Ohio, 5, Ctniiidus 1f'(i(/iipri, Nowb., of wliich a remnrkablj' lar^e and finely preserved palate tooth was exhibiteil, discovered by Mr. Frank Wagner
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. TRANSACTIONS OF SECTION C. 725 teeth, sonimvlinl like a shoe-last in forin, which played upon stronp:, flattened, bony plates tliat covered the roof of the mouth. These, like Diploijnathm, are from the |[m'0)i .-hale of Ohio, 5, Ctniiidus 1f'(i(/iipri, Nowb., of wliich a remnrkablj' lar^e and finely preserved palate tooth was exhibiteil, discovered by Mr. Frank Wagner in the Cleveland tliale near the base of the ('iirboniferous system at (,'leveland, Ohio. (J. Spines of two species of Udi'stus, Leidy, from the Coal Measures of Indiana and Illinois, which show distinctly the structure and mode of growth of these re- markable defensive weapons. Tiiey are from 10 to 18 inches in length, very massive and strong, and consist of a series of sheathing segments iirmly soldered tno'ethtM', each carrying a triangular, crenulated, and enamelled denticle from 1 to 2 inclies in length. The spines are symmetrical and weie therefore located on the median line like the spines of Trmioii, and were probably the defences of large sharks or y\\\a which inhabited the inland waters of the Continent in the Carboni- l-Vruiis age. SATURDAY, AUGUST 30. The Section did not meet. MOXBAY, SEPlEMIiER 1. The following Papers and Rejjort w^ere read :ââ 1, On the Fusdl Ecticnlatr Sponrjes constituting the Familij Dicfijofjjongidoe. Bij Professor James Hall, ()m knowledge of these forms in America dates back to 1842, when Mr. 'niirad described a peculiar fossil body inider the name ITydnoceras (in the belief nC its relation to Orthoceras). Subsequently in the same year another form by A'anuxeni as a marine plant, and in 1802 Dawson as Alga?, and followed by J lull ill IfO'f'd, who described several of the species under the name Dictyophytou ; adopt- ing Vaiiuxcnr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
