122 Mr. 51. A. C. Hiutoii on 



England, but the bullae are rather smaller ; the incisive 

 foramina are distinctly smaller; the masseteric plate is wider 

 and the molars slightly longer (as in Alderney). 



The JNlanx skulls agree in size with the English ones 

 (c.-b. 1. 23*l-23'2) ; a slightly decreased postmolar lengtli^ 

 a slightly increased palatal length, with a longer diastema, 

 wider incisive foi"aniina, and deepening o£ the brain-case are 

 the principal modifications. 



The Irish skulls (c.-b. 1. 22-5-23-7) have the zygomatic 

 breadth relatively smaller than in English, though greater 

 than in Welsh or Scotch specimens ; the interorbital and 

 cranial widths are about as in Wales, but the brain-case is 

 more depressed ; the postmolar length is rather short, the 

 bullae slightly smaller than in England ; the average palatal 

 length is slightly diminished. Irish skulls agree more 

 closely with those from England and Wales than with Scotch 

 specimens. 



The skulls of the wood-mice taken on Clare Island and 

 Inishmore"^, off the west coast of Ireland, were unfortunately 

 macerated, and are now in fragments. In one from Inish- 

 more, with much worn teeth, the condylo-basal length 

 appears to have been about 24 ; other dimensions were : — 

 interorbital constriction 4*2 ; palatal length 13 ; nasals 

 9*3x2*7; diastema 6*9; incisive foramina 5*8 X 1*8; rostral 

 breacith 4'5 ; masseteric plate 2*4 ; cheek-teeth (crowns) 4 ; 

 mandible 14*5. This is a large-skulled form which might be 

 worth further investigation. 



B. Hebriuean Races. 

 Apodemus sylvaticus. 



Hab. Skye. 



Material examined and dimensions. Three from Armadale 

 and one fi'om Ardvasar, collected by Mr. P. D. Montague; 

 and eleven from Uig and Struan, collected by JNIr. C. II. B. 

 Grant ; — 



Tail, Hind foot, 



In appearance these mice are much like those from the 

 Scotch highlands and Bute ; the backs are rather dark and 

 * Barrett-Hamilton, Proc. Eoj. Irish Acad. xxxi. p. 2 (191 2j. 



