PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 



PAGE 



Prolagostomus imperialis : Right lower teeth, crown view, X ^. 

 A. M. N. H. No. 9,587 . 456 



Pliolagostomus notatus : Left mandibular ramus, crown view, 



X ^. Ameghino collection 458 



Sphodromys scalaris: Left lower promolar, X f. Ameghino 



collection .......... 460 



ScoT^UMYS iMMiNUTUS : Left upper molars, crown view, X -f . 



Ameghino collection . . . . . . . . 459 



EocARDiA perforata : Skull, left side, X -^. No. 15,010 . . 477 



Skull, base, X ^. No. 15,010. 

 Right upper teeth, X f. No. 15,010. 

 Right lower teeth, X f. No. 15,010. 



EocARDiA DiviSA : Left lower milk-premolar and first molar, X f. 



Ameghino collection ........ 479 



EocARDiA EXCAVATA : Right lower teeth, crown view, X f . Ame- 

 ghino collection. {Ty^e o{ Tricar dia gracilis,) . . . 474 



ScHiSTOMYS ERRo, juv. : Right upper teeth; crown view, X f . No. 



15,383 486 



ScHiSTOMYS ERRO, juv. : Right lower teeth, crown view, X f . 



No. 15,383. 

 EocARDiA sp., juv. : Left upper teeth, crown view, X f . Ame- 

 ghino collection. (Referred to Hedimys integrus,) . . . 462 

 N. B. In Figs. 15, 17, 19 and 20 the transverse plates of enamel are made too 

 thick ; they should have been indicated by a single line, as in Fig. 18. 



Fig. 



19. 



Fig. 



20. 



Fig. 



21. 



Fig. 



22. 



Fig- 

 Fig. 



Fig- 

 Fig. 

 Fig. 



23- 



23«. 



23(5. 

 24. 



Fig. 



25- 



Fig. 



26. 



Fig. 



26a. 



Fig. 



27. 



(vol. v) 



