DENTITION. 



347 



From odotis, odonios, a tooth. 



Anodon, 

 Boodon, . 

 Cynodon, . 

 Deirodon, . 

 Dinodon, . 

 Glyphodon, 

 Heterodon, 

 Isodon, 

 Lycodon, . 

 Ogmodon, . 

 Oligodon, . 

 Rachiodon, 

 Sepedon, . 

 Tomodon, . 

 Xenodon, . 



Toothless. 



Ox tooth. 



Dog's tooth. 



Neck tooth. 



Double tooth. 



Grooved or carved tooth. 



Abnormal tooth. 



Equal toothed. 



Wolfs tooth. 



Furrowed or grooved tooth. 



Few toothed. 



vSpine toothed. 



Noxious tooth, or a tooth causing putridity, 



Stump tooth. 



Strange tooth. 



In Dumeril's system very many families, including some- 

 times several of the above, are grouped according to their 

 teeth, thus : — 



Ag lyphodon ics, 



Holodojiies, 



Anholodontes, 



Aproterodontes, 



Isodontiens, 



Apistoglyphes, 



F'roteroglyphcs, 



Solcnog lyph es, 



Teeth not carved or notched. 



Whole or entire teeth. 



Without whole or entire teeth. 



Without front teeth. 



With even teeth. 



Grooved at the back, or the back teeth grooved. 



Grooved in front, or the front teeth grooved. 



Cut or carved with a canal. 



And some others whose names are equally descriptive. 



These various characters, with the exception of Aprotero- 

 dontes^ which refers to the under jaw, have reference to the 

 upper jaw only. It might be tedious to the reader to enter 

 into a minute description of each of the above groups : 

 sufficient for our present purpose is it to show that such 

 varieties exist, and that a simple, even row of teeth, as 

 a family distinction, is oftener the exception than the rule. 



