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

 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.