Figs. 9, & 12. Trigonellites lata, of Mr. Parkinson.

Figs. 10, & 11. —— lamellosa.

Figs. 13, & 14. Corbida revoluta, of Sowerby. London clay, Highgate.

Fig. 16. An imperfect specimen of Lysianassa (Mya) literata, from the fullers' earth of the Oolite, Wiltshire.

Figs. 15, & 17. Cardita senilis, of Sowerby. From the Red crag of Suffolk.

Plate LXV.