PATAGONIAN EXPEDITIONS: PALAEONTOLOGY. 



EXPLANATION OF PLATE LXV. 



Fig. I. 



Fig. I a. 

 Fig. \b. 

 Fig. 2. 



THYLACYNUS CYNOCEPHALUS : Skull and mandible from the right 



side, about two thirds the natural 

 size (i. e., .68). Specimen in the 

 collection of the British Museum 



(Nat. Hist.) 342 



" " Skull, palatal view. British Museum 



(Nat. Hist.). About two thirds the 

 natural size (i. e., .68). 



" " Skull, posterior view. British Mu- 



seum (Nat. Hist.). About three 

 fourths the natural size (i. e., .74). 



" " Mandible, crown view, about three- 



fourths the natural size (i. e., .74). 

 Osteological collection, Princeton 

 University. 



Fig. 3. TRICHOSURUS VULPECULA : Skull of a young individual, palatal view, 



X -^. No. 413, osteological collection, 

 Princeton University. Young indi- 

 vidual lacking M- .... 443 

 Mandible of the same individual, crown 



view, X . 



Skull, palatal view, X \. No. 510, osteo- 

 logical collection, Princeton University. 

 This individual is anomalous in lacking 

 the last upper molar . . . . 426 

 Mandible of the same individual, crown 

 view, X \. 



Fig- 3. 

 Fig. 4. 



Fig. 4. 



PETAURUS AUSTRALIS (?) 



(VOL. iv.) 



