AQUATIC PACHYDERM ATA. 



129 



85.— Skull of Dugong. 



85*.— Skull of Manatee. 



portions advancing forwards, so as to enter into the 

 upper margin of tiie nasal orifice, and form tlie ceiling 

 of the orbits. The intermaxillary bones (a) advance 

 far forw^ards, but are destitute of teeth, excepting during 

 the early stages of the animal's existence ; these bones 

 form the lateral edges of the nasal orifice, which is very 

 spacious ; but in the living animal the bones are con- 



