MAMMALS FROM THE INNER HEBRIDES. 939 



Ventral fur characters : — 



8. General colour. 



9. Short hairs, length grey hases, 



10. „ „ ,, and colour tips. 



11. Longer hairs, length grey bases. 



12. „ „ „ and colour tips. 



Muck, 3£. a. luch; Eigg, M. a. mial ; Gigha, M. a.fiona; Islay, M. a. maegil- 

 livraii; Typical, -M". a. exsul; N. Uist, S. Uist, .Jura, Ari'an, Mull, M. a. neglecttis; 

 Mainland, Bute. 



An examination of the skulls fi^om all the localities visited 

 leads to the conclusion that the present systematic grouping, 

 based on the degree of reduction of the 4th inner angle of mi, 

 is an inaccurate one. This character is one which, seldom constant 

 even locally, varies very readily, and undoubtedly its variation 

 does not correspond with degree of differentiation in other 



Text-figure 1. 



DJ. 



D.^. 



D.2. 



D.S. 



n n 



D.5. 



D.6. 



D.7. 



Dm^raw 1. Temporal shield : Type 1. D. 2. Temporal shield : Intermediate type. 

 B. 3. Temporal shield : Tj^pe 3. D. 4. Posterior part of palate : Type 2. 

 I>. 5. Posterior part of palate: Type 1. D. 6. Anterior part of jugal of 

 M. a. fiona. D. 7. Anterior part of normal jugal. 



respects from the primitive type. Steps are being taken to 

 secure specimens from most of the hitherto unvisited islands, 

 and M. A. C. Hinton and I. Gr. S. Montagu are undertaking a 

 definitive revision of the gi'oup. Accordingly, in spite of the 

 incongruous position of many M. agrestis forms, no attempt is 



