102 Polecat, Ferret, and Polecat -Ferret Hybrids 



4 5 



Diagram I. 



1. Ferret skull, adult ^. 



2. Polecat skull, adult ^J. 



3. Skull of an F^^ individual, adult ^ No. 10. 



4. Skull of No. 45, immature ^, the produce of an i^j x Polecat mating. 



5. Skull of No. 19, adult $ , the produce of an Fi x Ferret mating. 



