A Manual of Elementary Geology / or, The Ancient Changes of the Earth and its Inhabitants as Illustrated by Geological Monuments

by Sir Charles Lyell

Fig. 297.

Terebratula spinosa. Inferior Oolite.

Fig. 298.

• a. Pholadomya fidicula, ¹/₃ nat. size. Inf. Ool.
• b. Heart-shaped anterior termination of the same.

Fig. 299.