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Show iv LIST OF PLATES. XXIV. (continued). F ig. 2. Orycteropus. Fig. 3. Dasypus. Fig. 4·. ~fynnecoplwya ju&ata; all onethird nat. size. XXV. F ig. 1 and 2. H umerus, radius and ulna of SceNdotlterium. Fig. 3. Head of humerus. F ig. 4·. Head of radius. Fig. 5, 6, and 7. Femur of Sceliclotlterium. XXVI. Fig. 1, 3, and 5. Astragalus of .Afeyatltet ·imn. Fig. 2, 4, and G, Astragalus of Srelidotlterium. XXVII. Fig. 1 nntl 2. Patella and head of t ibia of Scelidotlteriwn. Fig. 3, 4·, nnrl 5. Ungueal phalanx of Scelidotltel'ium. XXVIII. Fig. 1. Astragalus of Afegatlte1·ium. F ig. 2. Astragalus of Scelidotherium . Fig. 3-G. Astragalus of Afylodon or Afegalony.'IJ. XXIX . Lower jaw of ~fegalony:v J rjfer·sonii. XXX. Fragment of tho Cranium of Nr:qatlter ·ium Cuvie1·i. XXXI. Section of tho upper jaw and teeth of tho A1e,r;atlteri1tm Cuvier·i. XXXII. l<'ig. 1. Magnified view of structure of molar of Megatlte1·imn. F ig. 2-5. U ngucal phalanx and portions of tesselated armour of floploplwnts eupltractus. F ig. G-1 1. J aws and teeth of Cteuomys priscus. Fig. 12. Bones of right hind -foot of a Rodent. Fig. 13 and14. Fossil tooth ofa Ilor5e. PREFACE. H1s MAJESTY's ship, Beagle, under the command of Captain FitzRoy, was commissioned in July, 1831, for the purpose of surveying the southern parts of America, and afterwards of circumnavigating the world. In consequence of Captain FitzRoy having expressed a desire that some scientific person should be on board, and having offered to give up part of his own accommodations, I volunteered my services; and through the kindness of the hydrographer, Captain Beaufort, my appointment received the sanction of the Admiralty. I must here, as on all other occasions, take the opportunity of public1y acl{nowledging with gratitude, the obligation under which I lie to Captain FitzRoy, and to all the Officers on board the Beagle, for their constant assistance in my scientific pursuits, and for their uniform kindness to me throughout the voyage. On my return (October, 1836) to England, I found myself in posse swn A |