268 



ZOOLOGY. 



Order 6. Slrenia. — General Characters of Sirenians. — 

 This small group is represented by the sea-cow or manatee 

 of Florida. The lower jaw is unlike that of whales, being 



much as in the cow or horse, while the teeth are well devel- 

 opcd, both incisors and molars, the latter with flattened or 

 ridged crowns, adapted for the trituration of vegetable 



