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Halitherium
''Halitherium'' was an early sea cow that started in the late Eocene, then the Oligocene. Its fossils are common in European shales. Inside its flippers were finger bones that did not stick out. ''Halitherium'' also had the residues of back legs, which did not show externally. However, it did have a basic femur, joined to a reduced pelvis. ''Halitherium'' also had elongated ribs, presumably to increase lung capacity to provide fine control of buoyancy. ==Classification== ''Halitherium'' is the type genus of the subfamily Halitheriinae, which includes the well-known genera ''Eosiren'' and ''Eotheroides'' and lived from the Eocene to the Pliocene.〔D. P. Domning. 1996. Bibliography and Index of the Sirenia and Desmostylia. Smithsonian Contributions to Paleobiology 80:1-611〕
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