LErORIDiE— CRANIAL CHARACTERS. 



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III. Postorbital process anchylosed with the skull. Hind feet short. Pelage 

 never white. 



A. Width of the skull 'naif of the length. 



10. Size medium. Tail long palustris. 



B. Width of the skull considerably less than half the length. 



11. Size large. Tail short aqualicus. 



Table III. — Showing the ralio of the width and other mcasurenunts of the skull to the length. 



