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Physa columnaris, Desh. Melanopsis buccinoidea, Ferr.; recent. The univalve shells most characteristic of fresh-water deposits are, Planorbis, Limnaea, and Paludina. Neritina globulus, Def. Nerita granulosa, Desh.
Indeed I have heard more than once that the famous "Pâte de Guimauve" owes its healing nutritive character to this despised univalve, which is said to enter largely into its composition. I brought several apple snails home with me from Box Hill and kept them for many years, until I really believe the creatures, in a dim sort of way, recognized me as their friend, or at any rate their feeder.
This discovery is so much the more interesting, as it does not appear that any of these adhesive animals were ever before found in univalve shells. On this same day died my colleague, M. Levillian.
The Univalve Shells or Gasteropods of the Tertiaries embraced all the families now living, including land and fresh-water Shells as well as the marine representatives of the type. Some of the latter, as, for instance, the Cerithium, are accumulated in vast numbers. The limestone quarries out of which Paris is chiefly built consist wholly of these Shells.
We picked up at least twenty different sorts of gracefully shaped pieces of coral, and quantities of shells of an infinite variety of form and colour; cowries, helmet-shells, the shells from which cameos are sometimes cut; mother-of-pearl shells, and a large spiral univalve, nearly a foot long, with dark brown spots and stripes on a delicate cream-coloured ground, like the skin of a tiger or leopard.
Besides the Belemnite there are other genera, such as Baculites and Hamites, never found in strata newer than the cretaceous, but frequently met with in these Maestricht beds. On the other hand, Voluta, Fasciolaria, and other genera of univalve shells, usually met with only in tertiary strata, occur. The upper part of the rock, about 20 feet thick, as seen in St.
Eschara disticha. White chalk. a. Natural size. b. Escharina oceani. a. Natural size. b. Part of the same magnified. A branching sponge in a flint, from the white chalk. From the collection of Mr. The general absence of univalve mollusca in the white chalk is very marked. Palatal tooth of Ptychodus decurrens. Lower white chalk. Cestracion Phillippi; recent. Port Jackson.
At one level, for example, univalve shells of some one or more species predominate; at another, bivalve shells; and at a third, corals; while in some formations we find layers of vegetable matter, commonly derived from land plants, separating strata.
In the highest and steepest parts of the mountain chain may be found marine petrifactions of every variety the sea-hedgehog, the oyster, the mussel, and the star-fish; and in the beds of trachytic rock, deposited in such order that one might fancy they had been placed there by a careful and tasty housewife, are layers of the most curious shells, univalve, bivalve, sublivalve and multivalve, madrepors, and shapeless remnants of creatures now no longer known, and petrified fish.
We find lacustrine marls on the sides of the Esquiline Hill where it slopes down into the Forum, and fresh-water bivalve and univalve shells in the ground under the equestrian statue of Marcus Aurelius on the Capitol; while on the face of the Aventine Hill, overhanging the Tiber at a height of ninety feet, is a cliff of travertine, which is half a mile long.
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