PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 



EXPLANATION OF PLATE XVIII. 



PAGE 



Fig. I. Theosodon lallemanti : Left half of mandible, with milk-dentition, 



X ^. (No. 16,002. ^4 last milk-pre- 

 molar ; ot^, first molar.) , , . 112 

 Fig. ia. " " Cheek-teeth of same individual, crown 



view, X ^. 

 Fig. 2. Theosodon garrettorum, type : Atlas, ventral side, X ^. (No. 



15.164.) 120 



Fig. 3. Theosodon LALLEMANTI : Axis, left side, X ^. (No. 15,216.) 



Fig. 3(2. " " Anterior view of same specimen, X^ . 121 



Fig. 4. Theosodon garrettorum, type : Fifth cervical vertebra, right side, 



Xi (No. 15,164.) . . . 123 

 Fig. 4«. " " " Fifth cervical vertebra, ventral 



side, Xi (No. 15,164.) 

 Fig. 5. Theosodon sp. : Three anterior thoracic vertebrse, left side, X ^. 



(No. 15,165.) 125 



Fig. 6. Theosodon garrettorum, type : First thoracic vertebra, anterior 



view, X ^. (No. 15,164.) . . 124 



Fig. 7. Theosodon lallemanti : First lumbar vertebra, left side, X ^. 



(No. 15,216.) 126 



Fig. 8. Theosodon garrettorum, type : Sacrum, ventral side, X J. (No. 



I5.I64-) 127 



Fig. Sa. " " " Sacrum, anterior face, X -|. (No. 



15,164. L', facets for trans- 

 verse processes of last lumbar 

 vertebra.) 

 Fig. 9. Theosodon lallemanti : Posterior part of mesosternum, dorsal side, 



X-J. (No. 15,216. X, xiphisternum.) 127 

 Fig. 10. Theosodon garrettorum, type : Left humerus, dorsal side, X ^. 



(No. 15,164.) 129 



All figures, except fig. la, one-half natural size. 



(vol. vn.) 



