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Updated: May 22, 2025
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.
It then proceeds to suck the oyster out of its shell, and so powerful a suction organ has the starfish that he can pull an oyster through its shell, by forcing the bivalve to open. And it was a gigantic starfish, a hundred times as large as any Tom had ever seen, that had Ned in its grip. The creature had doubtless taken the diver for a new kind of oyster, and was trying to open it.
The evidence of the submergence of the pillars consists mainly of a zone commencing at the height of about 12 feet above their pedestals, and extending 9 feet upwards, in which are numerous perforations, made by a marine bivalve mollusc.
But this marvellous structure may be classed as a primary rather than as a secondary sexual character. Although with the Mollusca sexual selection does not seem to have come into play; yet many univalve and bivalve shells, such as volutes, cones, scallops, etc., are beautifully coloured and shaped.
One slays the other, and perishes himself upon the scaffold. Here is a direct chain of events with a sick mollusc for its first link, and a gallows for its last one. Had that grain of sand not chanced to wash in between the shells of the bivalve, two living breathing beings with all their potentialities for good and for evil would not have been blotted out from among their fellows.
We can no longer argue that, for instance, the beautiful hinge of a bivalve shell must have been made by an intelligent being, like the hinge of a door by a man."
I send you a specimen, which you can compare with those you brought from the lime quarry at Low-wood." I have examined this specimen, and find it to be the common schistus of that country, only containing many bivalve shells and fragments of entrochi and madrapore bodies, and mixed with pyrites.
In the second place, a duck's tongue is a very short and stiff affair, and is fixed in the lower mandible as in a trough. Ducks do not protrude the tongue when they feed; they cannot protrude it; and if a duck can crush a mussel-shell with its beak, what better position could it have the bivalve in than fast to the tongue between the upper and the lower mandible?
Cyrena obovata, Sowerby; fossil. Anodonta Cordierii; D'Orbigny; fossil. Anodonta latimarginata; recent. Unio littoralis. Lamarck; recent. Almost all bivalve shells, or those of acephalous mollusca, are marine, about sixteen only out of 140 genera being fresh-water.
One is that the pearl is produced as a consequence of the presence of dead bodies of a diminutive parasitical tapeworm which commonly affects the Ceylon bivalve. The living tapeworm does not induce pearl formation.
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