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"Two genera," our scholarly Conseil hastened to say, "that belong to the family Pinnipedia, order Carnivora, group Unguiculata, subclass Monodelphia, class Mammalia, branch Vertebrata." "Very nice, Conseil," I replied, "but these two genera of seals and walruses are each divided into species, and if I'm not mistaken, we now have a chance to actually look at them. Let's."
It ranks under the 'class' MAMMALIA, because it has teats, by which the female suckles her young; the 'tribe' UNGUICULATA, because its extremities are armed with nails; the 'order' DIGITIGRADES, because it walks principally on its toes.
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.
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