MAMMALS FROM THE INNER HEBRIDES. 



937 



Description. This form resembles A. h. Uiral in general colour, 

 but is dorsally darker, being the darkest form of A. hehriclensis ; 

 the dark hairs are distributed evenly, though more abundant 

 in a median position. The ventral surface is silvery and the 

 pectoral spot is faint. 



The appendage measurements resemble those of A. h. tural, 

 the ears being longer than those of-^. h. maclean. 



Like A. h. tural the skull measurements resemble those of 

 A. h. hehriclensis and differ from those of A. h. maclean in showing 

 larger zygomatic, interorbital, and cranial breadths, larger cranial 

 depth, and broader rostrumi and masseteric plate. The skull, 

 however, resembles that of ^. ^. maclean and differs from that of 

 A. h. tural in the smallness of its bullae ; further, it shows a 

 peculiarly large width of the incisive foramina. 



Apodemus skull dimensions. 





(3) 

 Gt. Cumbrae. 



(2) . 

 Tiree. 



(2) 

 Gigha. 





(8) 

 Tslay. 



(4) 

 Jura. 



(3) 

 Mull. 



No. 



A. h. 



A.h. 



A.h. 





AJi. 



A.h. 



A.h. 



of D. cumhrcB. 



tircB. 



gliia. 





tural. 



larus. : 



maclean. 



1. 



23-16 



22-70 



24-36 





23-53 



23-84 



23-73 



Irt. 100 



100 



100 





100 



100 



100 



2. 



110-75 



110-00 



107-90 





109-36 



109-40 



109-83 



3. 



56-56 



56-00 



53-40 





54-20 



54-65 



53-03 



4. 



16-80 



17-40 



17-60 





17-69 



17-50 



17-28 



5. 



51-00 



50-50 



48-20 





48-66 



49-38 



48-26 



6. 



35-60 



35-50 



35-72 





35-13 



34-99 



34-06 



7. 



45-56 



46-30 



46-20 





45-78 



46-03 



45-90 



8. 



26-60 



26-45 



26-37 





26-39 



25-81 



25-93 



9. 



40-23 



42-10 



39-45 





40-05 



40-85 



41-80 



10. 



11-91 



11-70 



11-90 





11-97 



12-08 



11-93 



11. 



54-33 



55-95 



55-90 





54-34 



54-65 



54-03 



12. 



28-90 



28-65 



29-08 





29-34 



29-47 



29-90 



13. 



23-56 



24-70 



22-22 





23-40 



24-09 



24-70 



14. 



7-46 



7-73 



8-66 





8-13 



9-09 



6-86 



15. 



18-96 



19-80 



19-62 





19-30 



19-94 



18-83 



16. 



10-66 



10-35 



11-41 





10-77 



11-89 



10-26 



17. 



16-25 



16-25 



16-02 





15-92 



16-22 



16-05 





Number 



in ( ) of skulls on 



which averages are 



based. 





1. 



Condj'lobasal length : avera 



ge in 



8. 



Condyle to front surface of bulla. 





millimeti-es. 







9. 



Nasal length. 









Reductions : 



;— 





10. 



Nasal width. 







\a 



:. Condylobasal length equals 



100. 



11. 



Palatal length. 







2. 



Occipitonasal length. 





12. 



Diastema. 







3. 



Zygomatic breadth. 





13. 



Length of incisive foramina 





4. 



Interorbital constriction. 





14. 



, Width of incisive foramina, 





5. 



Cranial width. 







15. 



Rostral breadth. 





Cranial depth, in middle. 

 Postmolar length ; condyle to m.3. 



16. Width of masseteric plate (least). 



17. Cheek-teeth, coronal length. 



