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PALAEONTOLOGY 



FIG. 63. FISH TEETH AND SCALES. 



a-g, j, teeth ; h, i, scales. The dotted part in b-f is the root ; in h it is the 

 "part overlapped by other scales, a, Thelodus pagei (Powrie), Down- 

 tonian, skin-tooth from above; a', from below, showing nutritive 

 foramen ; a", from side. 6, Hybodus grossiconus Agassiz, Bathonian. 

 Tooth. (Natural size.) c, Acrodus nobilis Agassiz, Lower Jurassic. 

 Tooth. (Natural size.) d, Lamna appendiculata Agassiz, Upper 

 Cretaceous. Tooth. ( X . ) e, Corax falcatus Agassiz, Upper 

 Cretaceous. Tooth. (Natural size.) f, Carcharodon megalodon 

 Agassiz, Miocene-Pliocene. Tooth. (X|.) g , Ceratodus altus 



