AQUATIC PACHYDKRMATA. 12' 



83. — Vascular Apparatus of Whale. 



ribs are sixteen on each side. Fig. 84 represents the 

 skeleton of the dugong-, and Fig. 84* that of the mana- 

 tee. They may be compared together, and with the 

 skeleton of the porpoise, Fig. 94* (a true cetacean), with 

 advantage. 



Fig, 85 represents the skull of the dugong ; Fig. 85*, 

 that of the manatee. The skull of the manatee may be 

 distinguished from that of the dugong by the following 

 particulars : — The nasal bones are very small, and im- 

 bedded, so to speak, in the frontal, which consist of two 



G 2 



