PATAGONIAN EXPEDITIONS ! PALEONTOLOGY. 



EXPLANATION OF PLATE LXVIL 



Fig. I. SciAMYS LATiDENS, type : Skull, top, X -^. No. 15,944. 



Fig. la. '' '' '' Skull, base, X •^. No. 15,944. 



Fig. lb. '' '' '' Skull, left side, Xf No. i5,944- 



Fig. ic. '' '' '' Left upper teeth, X f. No. 15,944 



Fig. id. '' '' '' Left lower teeth, Xf. No. 15,944 



Fig. le. '' '' '' Skull, left side, Xf. No. 15,944. The 



ventral border of the mandible has an unduly strong curvature, 

 due to the even fracture and loss of the incisor sheath. 



Fig. 1/ SciAMYS LATIDENS, type: Skull, base, Xf. No. 15,944 



Fig. ig. '' '' '' Skull, top, Xf. No. 15,944. 



Fig. 2. '' '' '' Right tibia and fibula, X f. No. 15,944 



Fig. 3. '' '' '' Right pes, dorsum, X f. No. 15,944 . 



Fig. 4. AcAREMYS MURiNus: Skull, top, X^. A. M. N. H. No. 9,280 



Fig. 4^. '' '' Skull, base, X ^. A. M. N. H. No. 9,280. 



Fig. 4^. '' '' Skull, side, X f A. M. N. H. No. 9,280. 



Fig. 5. SciAMYS VARiANS : Skull, top, X -^. No. 15,575 . . . . 



Fig. ^a. '' '' Skull, base, X ^. No. 15,575. 



Fig. 5^. " " Skull, side, Xi. No. i5,575i. 



Fig. 6. SciAMYS ROSTRATUS, type : Skull, top, X f. No. 15,287 



Fig. 6a. '' '' '' Skull, base, X f. No. 15,287. 



Fig. 6d. '' ^' '* Skull, side, X f. No. 15,287. 



Fig. 7. SciAMYS PRINCIPALIS : Skull, top, X f . No. 15,623 



Fig. 7^. '' '' Skull, base, X f. No. 15,623. 



Fig. 7^. '' ^' Skull, side, X-i-. No. 15,623. 



Fig. jc. '' '' Right upper teeth, Xf No. 15,623 . 



Fig. 7d. '' '' Right lower teeth, Xf. No. 15,623. 



Fig. 8. SciAMYS sp. : Left lower teeth, crown view, Xf. No. 15,283 



Fig. 9. SciAMYS VARiANS : Auditory region of skull, left side, X f . No. 

 15,168. S.s.m., supramastoid process of squamosal ; Ty., tym- 

 panic ; Per., periotic; P.t?^., paroccipital process ; F.M., foramen 

 magnum ........... 



Fig. 10. AcAREMYS MiNUTUs: SkuU, top, Xf. No. 15,806 



Fig. 10^. '' '' Skull, base, Xf. No. 15,806. 



Fig. 10^. '' '' Skull, side, Xf. No. 15,806. 



Fig. 10^. '' '' Right upper teeth, Xf. No. 15,806 . 



Fig. II. ?AcAREMYS MiNUTissiMUS : Fragment of right upper jaw, with p^ 

 andm^, Xf. No. 15,086 



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