240 DENTAL SYSTEM OF FISHES. 



DENTAL SYSTEM OF FISHES. 



The teeth -of fishes, whether we study them in regard 

 to their number, form, substance, structure, situation, or 

 mode of attachment, offer a greater and more striking 

 series of varieties than do those of any other class of ani- 

 mals. 



As to number, they range from zero to countless quan- 



Fig. 59. 



SKULL OF THE PIKE, SHOWING THE TEETH. 



titles. The lancelet, the ammocete, the sturgeon, the 

 paddle-fish, and the whole order of lejpliohrancMi^ are eden- 



Academj'^ of Sciences of the Institute of France on the same day, Decem- 

 ber 16, 1839, on which I communicated, on the occasion of my election 

 as corresponding member of that body, mj' " Theory of the development 

 of dentine by centi'ipetal calcification and conversion of the cells of the 

 pulp/' 



