PLATE LXV.

Fossil Shells.

Fig. 1. A single valve, viewed interiorly, of a fine shell (Panopæa Aldrovandi, of Faujas St. Fond) from the Pleistocene or Newer Tertiary strata, that form a chain of low hills near Palermo, in Sicily. The shells in these deposits comprise almost all the genera and species that now inhabit the Mediterranean. They occur in the most beautiful state, deprived only of their colour; and groups are often met with of extreme elegance. The cabinet of the Marquess of Northampton contains an extensive and unrivalled series of these fossils, collected during his Lordship's residence at Palermo.

Figs. 2, & 4. A boring bivalve (Fistulana or Lithodomus) from the Oolite, Bath.

Figs. 3, & 5. Valves of a small Oyster from the Crag of Essex.

Fig. 6. A group of Lithodomi in limestone from the Oolite, Bradford, Wilts.

Fig. 7. A detached specimen from the same, showing the enclosed bivalve.

Figs. 8, & 10. Fine but imperfect specimens of a species of Teredo (Teredina personata, of Lamarck), from the Plastic clay of Epernay, France.

Fig. 9. A snail-shell (Helix arbustorum) found associated, and evidently contemporaneous, with bones of Mammoth, and extinct species of Deer, and other mammalia. From Brentford, in a bed of light calcareous earth, twenty feet below the surface.

Fig. 11. "A concamerated Teredo."—Mr. Parkinson. I am unable to ascertain the nature of this fossil.