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Among the mollusks, a remarkable ribbed Melania, of the section Chilina, occurs. Ostrea distorta, Sowerby. Cinder-bed. Hemicidaris Purbeckensis, E. Forbes. Cyprides from the Middle Purbecks. a. Cypris striato-punctata, E. Forbes. b. Cypris fasciculata, E. Forbes. c. Physa Bristovii, E. Forbes. It was accompanied by a species of Perna.
Cyprides from the Lower Purbeck. a. Cypris Purbeckensis, Forbes. b. Same magnified. c. Cypris punctata, Forbes. d, e. This is the beginning of the inferior division, which is about 80 feet thick.
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