PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
Fig. i. 
Fig. 2. 
Fig- 3 - 
Fig. 4. 
Fig. 5 - 
Fig. 6. 
Fig. 7. 
EXPLANATION OF PLATE XVIII. 
Nesodon imbricatus : Skull, occipital view, X t (A. M. N. H., No. 
9234). Pty. = Post-tympanic portion of 
squamosal. Exoc. — Exoccipital. Mp. — 
Mastoid process. P.oc. — Paroccipital pro- 
cess. M.a.e. — External auditory meatus. 
Adinotherium ovinum : Lower milk-dentition, crown view, X t (A. 
M. N. H., No. 9517). Dp 4 = Fourth 
milk-premolar. M T — First molar. 
“ “ Upper dentition, crown view, X t (No. 
15,235). First permanent incisor, sec- 
ond and third milk-incisors. Dp- — 
Fourth milk-premolar. .... 
Nesodon imbricatus : Lower permanent dentition, crown view, X i 
(No. 15,215) 
Adinotherium ovinum : Lower permanent dentition, crown view, 
Xi (No. 131) 
Nesodon imbricatus : Lower milk-dentition, crown view, X t (No. 
15 . 354 ) 
“ “ Lower dentition, crown view, X 1 (No. 15,- 
115). Permanent incisors erupting. Dp ± 
— Fourth lower milk-premolar. = 
First molar. ...... 
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