PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
EXPLANATION OF PLATE NLVIII. 
Fig. i . Prothylacynus patagonicus : Left half of the skull, palatal view 
(No. 15,700) . . . . 
Fig. 1 a. “ “ Left half of the skull, dorsal view 
(No. 15,700) . . . . 
Fig. 2. “ “ Right half of the mandible, crown 
view (No. 15,700). The anterior 
and median premolars are re- 
stored from the opposite side 
Fig. 3. “ “ Skull, posterior view (No. 15,700) . 
All the figures are natural size. 
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(VOL. IV.) 
