A more accurate acquaintance with these strange creatures has, however, revealed to later voyagers that they are merely a race of animals very closely allied in their organization to Whales, which in form they closely resemble, while their internal structure shows them to be still more nearly related to the gigantic Pachyderm Quadrupeds, such as the Hippopotamus and the Tapir. The main feature which distinguishes the Herbivorous Cetaceans is their total want of hind limbs, a circumstance in which they resemble the true Whales and Dolphins; but in the structure of their nostrils they conform to the usual arrangement met with in four-footed Mammalia. Instead of whalebone or the sharp conical teeth of the Dolphins, they are furnished with broad, flat grinders, wherewith they chew their vegetable food, which consists principally of the sea-weeds, etc., abundant near the shores which they frequent. In short, as Buffon well expresses it, these creatures terminate the list of terrestrial quadrupeds and commence the history of the population of the sea, or, more correctly, form the connecting link between the Mammiferous inhabitants of the ocean and those of the river and the marsh. This family comprises the Manatees and the Dugongs. THE MANATEES. [Illustration: MANATEE.] These animals are distinguished by the arrangement of their teeth and by certain peculiarities in the structure of their head. The number of their teeth is considerable, their grinders have roots distinct from the crown of the tusk, which forms a grinding surface composed of transverse elevated ridges. The incisor teeth are quite rudimentary. Their only limbs somewhat resemble hands, and their fingers are provided with nails, while the fin at their tail is not forked, but single, and of an oval shape. These creatures seem to be intermediate in their structure between the Pachyderms and the Cetaceans, seeing that their grinding teeth very much resemble those of the Tapirs. Three species are known to Naturalists—one from South America, one from Senegal and one from Florida. THE SOUTH AMERICAN MANATEE. Although the western coasts of Africa were frequented by sailors in very ancient times, and known to Europeans long before the discovery of the American continent, the Manatee which is found upon the eastern shores of America was known to Naturalists before the African species. The interest aroused by the discovery of a new world attracted enlightened men, who flocked to its shore, and described its productions; while the African continent, never having received Europeans but as enemies, was in turn treated as an enemy’s country, and could only be visited at a considerable risk.