Macropus frenatus, xl, 217, 218.
— lateralis, xl, 217, 218.
— lunatus, xl, 217, 218.
— psilopus, xl, 218.
— robustus, xl, 217.
— unguifer, xl, 217, 218.
*Mastodon, notice of the tooth of, J. Wyman, xxxix, 53.
*—, on the denial system of, xl, 377.
*—, age of, xxvii, 352; xxx, 394.
*—, Big Bone Lick and elsewhere, geological position of, C. Lyell, xlvi, 320.