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These consist entirely of living species; but, in the first place, the common eatable oyster is among them, attaining its full size, whereas the same Ostrea edulis cannot live at present in the brackish waters of the Baltic except near its entrance, where, whenever a north-westerly gale prevails, a current setting in from the ocean pours in a great body of salt water.
Monoceros Blainvillii, d'Orbigny "Voyage" Pal. 2. Monoceros ambiguus, G.B. Sowerby. 3. Anomia alternans, G.B. Sowerby. 4. Pecten rudis, G.B. Sowerby. 5. Perna Gaudichaudi, d'Orbigny "Voyage" Pal. 6. Ostrea, small species, in imperfect state; it appeared to me like a small kind now living in, but very rare in the bay. 8. Mytilus Chiloensis; Mr.
Venus purpurata, Lam. 14. Venus rostrata, Phillippi. 15. Mytilus Darwinianus, d'Orbigny. 16. Nucula semiornata, d'Orbigny. 17. Cardita Patagonica, d'Orbigny. 18. Pecten tethuelchus, d'Orbigny. 20. Ostrea puelchana, d'Orbigny. 21. A living species of Balanus. 22 and 23. An Astrae and encrusting Flustra, apparently identical with species now living in the bay.
In 1854 the remains of another mammifer, small in size, but larger than any of those previously known, was brought to light. Portion of a fossil fruit of Podocarya Bucklandi, Ung., magnified. Cone of fossil Araucaria sphaerocarpa, Carruthers. Inferior Oolite. Bruton, Somersetshire. One-third diameter of original. Ostrea acuminata.
Juvenal attributes this quality to oysters which, together with mussles, have in this respect become vulgarly proverbial. "Quis enim Venus ebria curat? Inguinis et capitis quæ sint discrimina nescit Grandia quæ mediis jam noctibus ostrea mordet." "For what cares the drunken dame? Wallich informs us that the ladies of his time had recourse, on such occasions, to the brains of the mustela piscis.
This bed rested on one with bones of an extinct rodent, namely, the Megamys Patagoniensis; and this again on another with extinct marine shells. The species found by M. d'Orbigny in different parts of this formation consist of: Ostrea Patagonica, d'Orbigny, "Voyage, Pal." Ostrea Ferrarisi, d'Orbigny, "Voyage, Pal." 3. Ostrea Alvarezii, d'Orbigny, "Voyage, Pal."
"Oh dear, oh dear, Tom," said Maggie, "what a time you are! Ut " "Ut ostrea " "No, no," said Maggie, "ut tigris " "Oh yes, now I can do," said Tom; "it was tigris, vulpes, I'd forgotten: ut tigris, volupes; et Piscium." With some further stammering and repetition, Tom got through the next few lines. "Now, then," he said, "the next is what I've just learned for to-morrow.
Hence there cannot be any doubt, highly curious though the fact be, that these several fossils, namely, the Hippurites, Gryphaea, Ostrea, Pecten, Turritella, Nautilus, two Terebratulae, and Spirifer all belong to the same formation, which would appear to form a passage between the oolitic and cretaceous systems of Europe.
Ostrea Patagonica, d'Orbigny, "Voyage, Pal." Ostrea Alvarezii, d'Orbigny, "Voyage, Pal." Pecten Paranensis, d'Orbigny, "Voyage, Pal." Pecten Darwinianus, d'Orbigny, "Voyage, Pal." Pecten actinodes, G.B. Sowerby. 6. Casts of a Turritella. The four first of these species occur at St. Fe in Entre Rios, and the two first in the sandstone of the Rio Negro.
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