Page:Geology and Mineralogy considered with reference to Natural Theology, 1837, volume 2.djvu/217

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1. 2. Placoid.

3. 4. Ganoid.

5. 6. Ctenoid.

7. 8. Cycloid.

Characteristic scales of the four order of fishes. Agasiz.

Holoptychus. Hibberti.

Jaw and Teeth if Sauroid fishes. nat. size.