224 



PALEONTOLOGY 



FIG. 63. FISH TEETH AND SCALES. 



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

 ''"p'irt overlapped by other scales, a, Thelodus pagei (Powrie), Down- 

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

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

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

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

 Cretaceous. Tooth. ( X . ) e, Corax falcatus Agassi/., Upper 

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

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



