Fig. 12. A species of Fistulana, from France.

Fig. 13. External surface of Chama squamosa of Brander. London clay, Hordwell.

Figs. 14, & 15, are the anchylosed caudal vertebræ of the tails of fishes. From the London clay, Isle of Sheppey.

Fig. 16. "A small oyster with a spathose structure."—Mr. Parkinson. This shell is probably the flat valve of a species of Dianchora, of Sowerby; from the Chalk.

Plate LXVI.

PLATE LXVI.