Remains of Cetacea are tolerably abundant in Tertiary deposits, both in Europe and North America. In the Lower Pliocene of England, France, and Germany, extinct species of five or six living genera of whales and dolphins have been found; and most of these occur also in the Upper Miocene, along with many others, referred to about a dozen extinct genera. In the Post-pliocene deposits of Vermont and South Carolina, several extinct species have been found belonging to living genera; but in the Miocene deposits of the Eastern United States cetacean remains are much more abundant, more than 30 species of {210}extinct whales and dolphins having been described, most of them belonging to extinct genera. The Zeuglodontidæ, an extinct family of carnivorous whales, with double-fanged serrated molar teeth, whose affinities are somewhat doubtful, are found in the older Pliocene of Europe, and in the Miocene and Eocene of the Eastern United States. _Zeuglodon_ abounds in the United States, and one species reached a length of seventy feet. A species of this genus is said to have been found in Malta. _Squalodon_ occurs in Europe and North America; and in the latter country four or five other genera have been described, of which one, _Saurocetes_, has been found also at Buenos Ayres. _Order VI.--SIRENIA._ FAMILY 42.--MANATIDÆ. (3 Genera, 5 Species?) GENERAL DISTRIBUTION. __________________________________/\__________________________________ / \ NEOTROPICAL| NEARCTIC |PALÆARCTIC | ETHIOPIAN | ORIENTAL | AUSTRALIAN SUB-REGIONS|SUB-REGIONS|SUB-REGIONS|SUB-REGIONS|SUB-REGIONS|SUB-REGIONS. -----------+-----------+-----------+-----------+-----------+------------ | | | | | -- 2 -- 4 |-- -- -- --|1. -- 3 -- |1. 2 -- -- |1. 2. -- 4 |1 -- -- -- | | | | | The Sea-cows are herbivorous aquatic animals living on the coasts or in the great rivers of several parts of the globe. _Manatus_ (2 species) inhabits both shores of the Atlantic, one species ranging from the Gulf of Mexico to North Brazil, and ascending the Amazon far into the interior of the continent; while the other is found on the west coast of Africa. _Halicore_ (2 species?), the Dugong, is peculiar to the Indian Ocean, extending from Mozambique to the Red Sea, thence to Western India and Ceylon, the Malay Archipelago and the north coast of Australia. _Rytina_ (1 species), supposed to be now extinct, inhabited recently the North Pacific, between Kamschatka and Behring's Straits. _Fossil Sirenia._--Extinct species of _Manatus_ have been found in the Post-pliocene deposits of Eastern North America from {211}Maryland to Florida; and an extinct genus, _Prorastomus_, in some Tertiary deposits in the Island of Jamaica.