[26] See Sir Charles Lyell's Travels in the United States; and Drs. Yandell and Shumard's "Contributions to the Geology of Kentucky." Louisville, 1847.

Fig. 5, is a transverse section of a mass of chain-coral from Dudley.

Fig. 6. The same, as seen by transmitted light.

Plate XXXVI.

PLATE XXXVI.

Various Fossil Corals from different Formations.