The zoology of the voyage of H.M.S. Beagle [vol. 1 of 5]

Chapter 15: NOTICE OF FRAGMENTS OF MOLAR TEETH OF A MASTODON.

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The work offers a geological introduction followed by systematic, anatomical descriptions of fossil mammals collected on the voyage, with emphasis on South American extinct forms. It details crania, jaws, teeth, vertebrae, limb bones, and tesselated armour for taxa such as Toxodon, Macrauchenia, Glossotherium, Mylodon, Scelidotherium, Megalonyx, and Megatherium, illustrated by numerous plates. Comparative morphology and measurements underpin taxonomic identifications and interpretations of structural relationships, and a brief discussion addresses the geological contemporaneity of the described extinct mammals.

NOTICE OF FRAGMENTS OF MOLAR TEETH OF A
MASTODON.

Of the remains of this gigantic extinct Pachyderm, observed by Mr. Darwin at Santa Fé, in Entre Rios, and on the banks of the Tercero, the fragments of the teeth and portions of the skeleton which reached England, are not sufficient to lead to a determination of the species; but sufficiently prove it to have been nearly allied, if not identical, with the Mastodon angustidens of Cuvier, and unquestionably distinct from the Mastodon giganteum of the United States.