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Show LIST OF PLATES. PLATE I. Cranium of Toxodon Platensis, nat. size, basal view, with tlto sixth molar, right side llppcr jaw, and grind ing surface of the seventh molar left side. II. III. IV. V. VI. VII. VIII. Cranium of To.vodon Platensis, Ditto, side view. upper view. Ditto, back view, with two views of the sixth molar, right side, upper jaw. Fragment of lower jaw, and teeth of Toa:odon Platensis. Cervical vcrtcbr::e of the Macraucltenia Pataclwnica. Ditto, ditto, and of A ucltenia Llama. Lumbar vcrtcbrro of the Macrauclwnia P ataclwnica. a. Medium convex articular surface joiuing the body of the sacrum. b. b. Lateral concavities joining the transverse processes of the sacrum. c. Ossified ligament of an anchyloscd lumbar vertebra. IX. Fig. 1 and 2. Fragments of the Scapula. Fig. 3. Distal end of the femur of Afacrauclwnia Pataclta11ica. X. Proximal ends of the anchyloscd radius and ulna of Macraucltenitt Pataclwnica. XI. Bones of the right fure-foot, J.lfacraucltenia Pataclwnica. XII. Femur, Macraucltenia Pataclwnica. XIII. Anchylo cd tibia and fibula, ll£acraucltenia Pataclwnica. XIV. Right astragalus, ll£acrauclwnia Pataclwnica. XV. Fig. 1. External metatarsal bone of the right hind-foot. Fig. 2. Proximal end of internal metacarpal bone, right fore-foot. XV. (continued.) Fig. 3 and 4. Proximal end of middle metacarpal bone. Fig. 5 Proximal end of external metacarpal bone, right fore-foot, Macraucltenia Patacltanica. X VI. Fragment of cranium of the Glossotlta·ium. Fig. 1. Side view. Fig. 2. Base view. Fig. 3. Inside view, all half natural size. Fig. 4. Os tympanicum, natural size. XVII. Fig. 1. llfe(!alonyx Jq[enonii. Fig. 2. J.llef!alony.v laqueatus. Fig. 3 and 4. llfylodon Ilarlani. Fig. 5. Myloclon Darwinii. XVIII. Lower jaw of the Myloclon Darw'i?tii. XIX. Fig. 1. Side view of the lower jaw. Fig. 2 and 3. Last molar tooth. Fig. 4. Front view of the symphysis of the lower jaw, Afylodon Darwinii. XX. Portion of the skeleton of the celidvtlteriurn leptocepltalum. XXI. Fig. 1. Side view of the cranium. l<'ig. 2. Back view of the cranium. l<'ig. 3, 4, and 5, anterior molar, upper jaw Scelidotlteriurn. XXII. Upper view of the cranium of the Scelidotlterittrn. XXIII. Fig. 1. Inside view of cranium. Fig. 2. Articular surface for the lower jaw. Fig. 3. Section of upper jaw and molar teeth. Fig. 4·. Section of lower jaw and molar teeth, Scelidvtlterium. XXIV. Cervical and anterior dorsal vertcbrre of, Fig. 1. Scelidotlterium. |