. College collection of palaeontology. 10 VEKTEBRATA. No. 14. [179j Balsenodon gibbosus, Oweu. Cetotolite (cast). This fossil tympanic bone belongs to a large extinct whale, which probably, like some contemporary quadrupeds, retained charac- ters which are embryonic and transitory in existing cetaceans. It was found in the Red Crag (Pliocene) of Suffolk, England; but as it is water-worn and rolled, was doubtless washed out of older strata. The original specimen be- longs to the Ward Collection in the University of Rochester. ORDER SIRENIA. The Sirenians resemble the Cetaceans in form and mode
. College collection of palaeontology. 10 VEKTEBRATA. No. 14. [179j Balsenodon gibbosus, Oweu. Cetotolite (cast). This fossil tympanic bone belongs to a large extinct whale, which probably, like some contemporary quadrupeds, retained charac- ters which are embryonic and transitory in existing cetaceans. It was found in the Red Crag (Pliocene) of Suffolk, England; but as it is water-worn and rolled, was doubtless washed out of older strata. The original specimen be- longs to the Ward Collection in the University of Rochester. ORDER SIRENIA. The Sirenians resemble the Cetaceans in form and mode of life. They are herbivorous and subsist on the vegetation of estuaries and rivers, sometimes crawling on shore to feed-. Both jaws are armed with incisors, and molars with flat-ridged crowns, adapted for vegetable diet. The cervical vertebi'fe are not anchylosed as in the whale. The mammoe are pectoral. There is much in the organiza- tion of the Sirenians which indicates an affinity with the Ungulates. They first appeared in the Eocene of Europe, and are found in the American Miocene of the Atlantic region. In the Miocene Period the Diigongs and Manatees were abundant and more widely dis- tributed than now. Their fossil bones have the solid structure peculiar to the order. The genus Rhytina has only recently become extinct. No. 15. [175] Halitherium Skull and FEMrii (cast). This herbivorous- animal, related to the Dugong, lived by the sea-shore and the mouths of rivers. Remains have been found in every deposit above the Calcaire Grossier (Middle Eocene). These specimens were discovered in the Miocene at Flonheim, Rhine Valley. Size, 8x8. ORDER UNG-ULATA. This is the most numerous and comprehensive order of larger mammals, both extinct and living, and includes the beasts formerly classed as Ruminants and Solidungula, and all those called Pachy- derms, except the Proboscidians. The members of this order walk on the extremity of the toes,. Please note that these images
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