. The geography of mammals. •I .. Fig. 45.—The Dugong.(Halicore dugony.) and the Dugong {Halicore)—each representing a distinctfamily of the Order. The Manatee (Fig. 44, p. 202) is aninhabitant of the coasts and estuaries of both sides of themiddle Atlantic Ocean—one species (Manatus senegalensis)occurring on the African shores, and another (M. ameri- 204 THE GEOGRAPHY OF MAMMALS canus) on the South American coast and in the Antilles. Athird species (M. inunguis), so far as we know at present,is found only in fresh water high up the Amazon. The Dugong (Halicore) (Fig. 45, p. 203) is distribute
. The geography of mammals. •I .. Fig. 45.—The Dugong.(Halicore dugony.) and the Dugong {Halicore)—each representing a distinctfamily of the Order. The Manatee (Fig. 44, p. 202) is aninhabitant of the coasts and estuaries of both sides of themiddle Atlantic Ocean—one species (Manatus senegalensis)occurring on the African shores, and another (M. ameri- 204 THE GEOGRAPHY OF MAMMALS canus) on the South American coast and in the Antilles. Athird species (M. inunguis), so far as we know at present,is found only in fresh water high up the Amazon. The Dugong (Halicore) (Fig. 45, p. 203) is distributedfrom East Africa, along the shores of the Indian Oceanand its islands, to North Australia. Three species of thisgenus have been established—Halicore tabernaculi fromthe Red Sea, H. dugong from the Indian Ocean, and from Australia; but it is doubtful how far theseforms are actually Fig. 46.—The Right Whale. (Balfena mysticetus.) [Flower and Lyd. llamm., p. 236.] Besides Manatus and Halicore, a third quite distinctform of Sirenian was formerly an inhabitant of the NorthPacific This was Stellers Sea-cow (Rhytina stelleri), byfar the largest animal of the group, which was extermi-nated by human agency about 1768. Fortunately recentresearches in Behrings Island have been successful insupplying specimens of its skeleton for our principalmuseums, and Steller, its discoverer, left to posterity a goodaccount of its habits and anatomy. MARINE MAMMALS 205 Section IV.—Distribution of Cetaceans Adopting the recognized division of the Cetaceans intotwo sub-orders, Mystacoceti and according as towhether their mouths are furnished with baleen ( whale-bone ) or teeth, we will first consider the True or Whale-bone Whales, which consist of a single family Bahenida,usually divided into rive genera: BaJUena, Neobal&na,Rhachianectes, Megaptera, and Balamoptera.
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