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The lowest rock with organic remains yet discovered is "the Ungulite or Obolus grit" of St. Petersburg, probably coeval with the Llandeilo flags of Wales. Shells of the lowest known Fossiliferous Beds in Russia. Siphonotreta unguiculata, Eichwald. From the Lowest Silurian Sandstone, "Obolus grits," of St. Petersburg. a. Outside of perforated valve. b.
FOREIGN. Ungulite or Obolus grit of Russia. BRITISH. Tremadoc slates. FOREIGN. "Primordial" zone of Bohemia in part, with trilobites of the genera Paradoxides, etc. BRITISH. Menevian beds of Wales, with Paradoxides Davidis, etc. FOREIGN. Lower portion of Barrande's "Primordial" zone in Bohemia. BRITISH. Fundamental gneiss of the Hebrides? FOREIGN. Labradorite series north of the river St.
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