Cidaris Blumenbachii, [317], [397].
------- clunifera, [319].
------- cucumifera, [319].
------- intermedia, [316].
------- meandrina, [319].
------- Parkinsoni, [319].
------- sceptrifera, [319].
------- spinosa, [319].
------- stemmacantha, [319].
Cidarite, impression of, on flint, [320].