PATAGONIAN EXPEDITIONS: ZOOLOGY. 



EXPLANATION OF PLATE III. 



Zaedyus ciliatus : Three skulls, showing variation with age. Figures all 



natural size. 

 Fig. i-ib. Skull, c^ ad.. Swan Lake, Patagonia. No. 31, Colburn Collection. 

 Fig. 2-2b. Young male, Swan Lake, Patagonia. No. 32, Colburn Collection. 

 Fig. 3-3<5. A very old skull, junction of Rio Chico with Rio Santa Cruz. 



Am. Mus. No. 17,447 



(vol. hi) 



