682 



MANUAL OF ZOOLOGY. 



in the Gulf of Mexico, and another (M. Senegalensis) is found 

 on the west coast of Africa. They are generally found in con- 



Fig. 379. Fore-limb and hand of the Manatee (Manatus Americanus). 



siderable numbers about the mouths of rivers and estuaries, 

 often ranging far inland, and they appear to live entirely upon 



Fig. 380. A, Side-view of the skull of the Dugong (Halicore), showing the tusk-like 

 upper incisors ; B, Side-view of the skull of Manatee (Mauatus). (After Cuvier.) 



sea-weeds, aquatic plants, or the littoral vegetation. They are 

 large, awkward animals, with a dense, rugose, hairy skin, 

 attaining a length of from eight to ten feet as a rule, but 

 sometimes growing to a length of nearly twenty feet. 



5-5 6-6 



The Dugongs (Halicore, fig. 380, A) have 



or 



5-5 6-6 



molar teeth in the young condition, but these are never all in 

 use at one time. The molars are without enamel, and are 

 single-rooted. Inferior incisors are present in the young ani- 

 mal, but are wanting in the adult. The upper jaw carries two 



