PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
EXPLANATION OF PLATE XVII. 
Fig. i. Nesodon imbricatus : Upper milk-dentition, crown view, X 1 (No. 
1 5,354). M- = First molar. . 
Fig. i. “ “ Upper permanent dentition, crown view, X 2" 
(No. 15,135). P- — Fourth premolar. . 
Fig. 3. “ “ Upper permanent dentition, crown view, X i 
(No. 15,000). 
Fig. 4. Adinotherium ovinum : Upper dentition, crown view, X t (No. 
15,493). P- = Third premolar. Dp- 
— Fourth milk-premolar. 
Fig. 5. “ “ Upper permanent dentition, crown view, 
X t (No. 15,118) 
Fig. 6. Nesodon sp. : Lower milk-incisors from above, X t- Ameghino 
collection. ........ 
Fig. 7. Adinotherium ovinum : Permanent upper incisors beginning to 
erupt, anterior view, X t (No. 15,114). 
I- — Median incisor. Di- = Second 
milk-incisor. . . . . . 
Fig. 8. “ “ Upper milk-dentition, crown view, X t 
(No. 15,945). Dp k =■ Fourth milk- 
premolar. M- — First molar. . 
Fig. 9. “ “ Upper milk-dentition, left side, external 
view, X t (No. 1 5,945). Dp- = Fourth 
milk-premolar. . 
Fig. 10. “ “ Lower incisors, ventral view, X t (No. 
1 5,539), showing vestiges of 3d milk- 
incisors. ...... 
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