. Annual report of the Board of Regents of the Smithsonian Institution . Fig. 15.—Tooth of Tetrabelodonan<jiistidens ( X I). Dibelodon. The genus Dibelodon is known principally from the jaws, teeth,and tusks, though two splendid skulls of D. andium are preserved inthe Museo Nacional in Buenos Aires. The upper tusks are welldeveloped, displaying an elongated spiral form, with a well-devel-. FiG. IG.—Skull of Dibelodon andium. oped enamel band, but the lower jaw is quite short, though thesymphysis is longer and more trough-like than in the genera Mam-mut and Elephas. The lower tusks have enti
. Annual report of the Board of Regents of the Smithsonian Institution . Fig. 15.—Tooth of Tetrabelodonan<jiistidens ( X I). Dibelodon. The genus Dibelodon is known principally from the jaws, teeth,and tusks, though two splendid skulls of D. andium are preserved inthe Museo Nacional in Buenos Aires. The upper tusks are welldeveloped, displaying an elongated spiral form, with a well-devel-. FiG. IG.—Skull of Dibelodon andium. oped enamel band, but the lower jaw is quite short, though thesymphysis is longer and more trough-like than in the genera Mam-mut and Elephas. The lower tusks have entirely disappeared, andwith the shortening of the jaw the trunk must have become pendant,as in the modern elephants. The genus Dibelodon contains several species, among which areDibelodon humboldii (Cuvier), D. mirificium (Leidy), D. prcecursor(Cope), and D. andium (Cuvier). Of these Dibelodon humboldiiand D. andium ranged into South America and were, in fact, almost EVOLUTION OF THE ELEPHANT LULL. 659
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
