LIST OF PLATES. 



Plate I 



II 



III 

 IV 



V] 



VII 

 VIII 



XII 

 XIII 



XIV 



XV. 



Cranium of Toxodon Platensis, nat. size, 

 basal view, with the sixth molar, right 

 side upper jaw, and grinding surface of 

 the seventh molar left side. 

 Cranium of Toxodon Platensis, 



side view. 



Ditto, upper view. 



Ditto, back view, with two views 



of the sixth molar, right side, upper jaw. 



Fragment of lower jaw, and teeth of 



Toxodon Platensis. 

 Cervical vertebras of the Macrauchenia 



Patachonica. 

 Ditto, ditto, and of Auchenia Llama. 

 Lumbar vertebrae of the Macrauchenia 

 Patachonica. 

 a. Medium convex articular surface joining 

 the body of the sacrum. 

 6. b. Lateral concavities joining the transverse 

 processes of the sacrum. 

 c. Ossified ligament of an anchylosed lumbar 

 vertebra. 

 Fig. 1 and 2. Fragments of the Scapula. 

 Fig. 3. Distal end of the femur of Ma- 

 crauchenia Patachonica. 

 Proximal ends of the anchylosed radius 

 and ulna of Macrauchenia Patachonica. 

 Bones of the right fore-foot, Macrau- 

 chenia Patachonica. 

 Femur, Macrauchenia Patachonica. 

 Anchylosed tibia and fibula, Macrauche- 

 nia Patachonica. 

 Right astragalus, Macrauchenia Pata- 

 chonica. 

 Fig. 1 . External metatarsal bone of the 



right hind-foot. 

 Fig. 2. Proximal end of internal meta- 

 carpal bone, right fore-foot. 



IX. 



X 



x i :. 



XV. (continued.} 



Fig. 3 and 4. Proximal end of middle 



metacarpal bone. 

 Fig. 5 Proximal end of external meta- 

 carpal bone, right fore-foot, 

 Macrauchenia Patachonica. 

 XVI . Fragment of cranium of the Glossotherium. 

 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 . Megalonyx Jeffersonii. 

 Fio-. 2. Megalonyx laqueatus. 

 Fig. 3 and 4. Mylodon Ilarlani. 

 Fig. 5. Mylodon Darwinii. 

 XVIII. Lower jaw of the Mylodon Darwinii. 

 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, ' Mylodon Dar- 

 ■icinii. 

 XX. Portion of the skeleton of the Scelido- 

 therium leptocephalum. 

 XXI. Fig. 1. Side view of the cranium. 

 Fig. 2. Back view of the cranium. 

 Fig. 3, 4, and 5, anterior molar, upper 

 jaw Scelidotherium. 

 XXII. Upper view of the cranium of the Sceli- 

 dotherium. 



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, Scelidotherium. 



XXIV. Cervical and anterior dorsal vertebrae of, 

 Fig. 1. Scelidotherium. 



