. Bulletin - United States National Museum. Science. EAKLY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 317 Esthonia; Jewe limestone (Dl), St. Mathias, Baron Toll's estate, and Paesklill, Esthonia; Kegel limestone (D2) Kegel, Esthonia; Wassa- lem beds (D3), Uxnorm, Esthonia; Wesenberg limestone (E), Wesen- berg, Esthonia; Lyckholm limestone (Fl), Lyckholm and Lechts, Esthonia, and Hohenholm, Kertel, Paope, and Keilo, island of Dago. Plesiotypes.—Csit. Nos. 57430 to 57449, British Museum, specimens and thin sections from various localities in Russia, and the island of Oeland. DIPLOTRYPA
. Bulletin - United States National Museum. Science. EAKLY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 317 Esthonia; Jewe limestone (Dl), St. Mathias, Baron Toll's estate, and Paesklill, Esthonia; Kegel limestone (D2) Kegel, Esthonia; Wassa- lem beds (D3), Uxnorm, Esthonia; Wesenberg limestone (E), Wesen- berg, Esthonia; Lyckholm limestone (Fl), Lyckholm and Lechts, Esthonia, and Hohenholm, Kertel, Paope, and Keilo, island of Dago. Plesiotypes.—Csit. Nos. 57430 to 57449, British Museum, specimens and thin sections from various localities in Russia, and the island of Oeland. DIPLOTRYPA BICORNIS (Eichwald). Plate 5, figs. 3-3(/; text figs. 196-198. Dianulites bicomis Eichwald, Zool. spec, vol. 1, 1832, p. 181, pi. 2, fig. 15. Chsetetes heterosolen Keyserling, Beobachtungen avif einer Reise in das Pet- echora-Land, 1846, p. 181, fig. a, b.—Edwards and Haime, Monogr. des polyp, foss., 1852, p. 273. Monticulipora heterosolen Schmidt, Archiv. fur Naturk. Liv-, Ehst- und Kurlands, vol. 2, eer. 1, 1858, p. 228.—Milne-Edwards, Hist. nat. des Cor., vol. 3, 1860, p. 274. Ceriopora bicomis Eichwald, Lethsea Rossica, vol. 1, sec. 1, 1860, p. 413, pi. 25, fig. 3. Callopora heterosolen Dybowski, Die Chaetetiden der Ostbaltischen Silur-For- mation, 1877, p. 119, pi. 4, figs. Sa-d. Cfr. Diplotrypa limitaris Ulrich, Geol. and Nat. Hist. Surv. Minnesota, vol. 3, pt. 1, 1893, p. 286, fig. 18. Commencing in the Glauconite limestone and continuing through the Wassalem beds is a species of Diplotrypa equally as abundant as the associated D. petropolitana and HaUoporaf dyhowskii. This species was first described by Eichwald as Dianulites licornis, his illustra- tions being presented below as figure 196. Dybowski gave a full description and nu- merous figures of the species, but adopted Keyserling's specific name Tieterosolen, for the reason that the term hicornis was ap- plicable to only a par- ticular form of growth. Although this is true, the rules of nomencla- ture demand
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