F. Pitt 115 



important points that have been brought forward appear to be the indi- 

 cation of the Mendelian inheritance of a structural character (type of 

 skull), and the evidence concerning a variation due to the loss of a factor 

 appearing and maintaining itself in a state of Nature — i.e. the ery thristic 

 polecats of Cardiganshire. 



WORKS CONSULTED. 



1. Bateson, W. 1909. MendeVs Principles of Heredity. 



2. Forrest, H. E. 1907. Vertehrata Fauna of North Wales. 



3. Miller, G. S. 1912. Catalogue of the Mammals of Western Europe. 



4. Wright, F. S. 1916. " The Mammalian Fauna of North Cardiganshire," a paper 



in the Zoologist^ September 1916. 



5. PuNNETT, R. C. 1911. Mendelisni. 



Journ. of Gen. xi 



