CHAPTER VII. 



Section I. — Size of the head bearing the ordinary 

 jprojportion to that of the body. 



Genus? — Dolphin; Delphinus; L. 



GENERIC CHARACTERS. 



The form of the head is very various; there is 

 but one, semilunar, external orifice to the nostrils, 

 which is situated upon the crown of the head; the 

 trunk of the body is elongated; the tail fin is large, 

 bifurcated and horizontal. 



Dental System. 



The teeth of the pisciverous cetse scarcely differ 

 from each other, except in number, all appearing 

 to have the same form. They are conical and 

 slightly hooked; only the larger species have larger 

 teeth than the smaller, and when their series are 

 numerous, the anterior and posterior are smaller 

 than those in the middle. None of them have the 

 alveolar processes divided, nor multiplex roots; the 

 dental capsule remains for a long time free at the 

 base: but these teeth are not always growing, as the 



