EXPLANATION OF PLATE 4. 



ORDER OF EDENTATA. 



Fig. 3. Skull of the AY or Sloth. 

 Fig. 1. The AY, or Sloth. 

 Fig. 2. The Armadillo. 

 Fig. 4. The Pangolin, or Manis. 

 Fig. 5. The Ornithorynchus. 



ORDER OF RODENTIA. 



Fig. 12. The Beaver. 



Fig. 11. The Jerboa. 



Fig. 10. The Hamster. 



Fig. 9. The Marmot. 



Fig. 8. The Flying Squirrel 



Fig. 6. The teeth of a squirrel. 



Fig. 7. Front view of the lower incisors of a Squirrel 



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