PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 



EXPLANATION OF PLATE LXVIII. 



Fig. I. Perimys IMPACTUS : Skull, base, X ^. No. 15,88 l 



Fig. la. '' '' Skull, top, X f No. i5,88l In both figures 



the rostrum is restored from a skull in the Ameghino collection 

 Fig. 2. Perimys impactus : Right ramus mandibuli, side view, X ^. No 



15,697 . . . . . . . . . 



Fig. 2a. Perimys impactus : Right ramus mandibuli, crown view, X ^. No 



15,697. 

 Fig. 3. Perimys onustus : Right ramus mandibuli, side view, X ^. No 



i5>230 



Fig. ^a, Perimys onustus : Right ramus mandibuli, crown view, X -^. No 



15,230. 

 Fig. 4. Perimys PUELLUS : Skull, leftside, X ^. No. 15,284 . 

 Fig. 5. . Perimys ERUTUS : Skull, base, X -^. No. 15,873 . 

 Fig. 6. Perimys sp. : Left upper teeth, X ^, Ameghino collection. 

 Fig. 7. Perimys procerus: Skull, base, X ^. A. M. N. H. No. 9,507 

 Fig. 8. Perimys /emulus, type : Right mandibular ramus, crown view, X y 



Ameghino collection. . . 

 Fig. 9. Perimys impactus : Right mandibular ramus, side view, X |-. No, 



15.053 



Fig. ga, Perimys impactus : Right mandibular ramus, crown view, X -^ 



No. 15,053. 

 Fig. 10. Perimys ameghinoi, type : Left lower teeth, slightly less than 



natural size. Ameghino collection. .... 

 Fig. II. Perimys perpinguis : Right upper teeth, crown view, X ^. No 



15.227 



Fig. 12. Perimys perpinguis, type: Left lower teeth, crown view, X^ 



Ameghino collection . . . . . 

 Fig. 1 3. Perimys erutus : Right lower teeth, crown view, X^, No. 1 5, 105 

 Fig. 14. Perimys scalaris, type: Right upper teeth, crown view, X^ 



Ameghino collection . . . . . . 



Fig. 15. Prolagostomus profluens: Palate and teeth, X^. A. M. N. H 



No. 9,588 . . . 



Fig. 16. Prolagostomus divisus : Palate and teeth, X ^. No. 15,570 

 Fig. 17. Prolagostomus pusillus : Right upper teeth, crown view, X ^, 



Ameghino collection . 



Fig. 18. Prolagostomus profluens: Right upper teeth, slightly less than 



natural size. Ameghino collection ...... 



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