PATAGONIAN EXPEDITIONS I* PALAEONTOLOGY. 
EXPLANATION OF PLATE I. 
PAGE 
Fiof. i. Hegetotiif.rium mirabile 
Fig. 2. “ “ 
Fig. 3. 
Fig. 4. “ *• 
Fig. 5. 
Fig. 5 a. “ “ 
Fig. 5^. “ “ 
Fig. 6. “ “ 
Fig. 7. 
Skull and mandible, left side (No. 1 5,542). 70 
“ from above (No. 15,542). . . 72 
“ “ below “ “ . . 73 
“ “ behind “ “ . . 73 
Mandible crown view (No. 15,542). . 69, 75 
Second lower premolar, Xf (No. 15,542). 69 
“ “ “ “ (No. 15,432). 
showing outline of less worn tooth. . 69 
Mastoid cavity from behind (No. 15,505). 
The canal from the mastoid cavity 
opens into the tympanic chamber at 
x. m, mastoid ; am, auditory meatus ; 
e, exoccipital ; pp, paroccipital pro- 
cess ; t , tympanic. . . . . 71 
Lumbar vertebra from in front showing 
interlocking zygapophyses (No. 
15 - 093 ) 76 
All the figures except 5 a and 5$ are natural size. 
(vol. vi) 
