580 Mr. M. A. C. Hinton on 



LII. — Note on British Fossil Species 0/ Apodemus. 

 By Martin A. C. Hinton. 



The fossil remains of wood-mice before me were obtained 

 from deposits of four distinct ages. It now appears that 

 all are members of the Apodemus sylvaticus group. Of 

 ^1. agrarius or Micromys no trace has been discovered. 



1. CrOMERIAN (Forest Bed). 



Apodemus sp. 

 Mus sylvaticus, Newtou, Vert. Forest Bed, p. 93, pi. xiv. fig. 11 (1882). 



Horizon. Upper Freshwater Bed of West Rmiton, Norfolk. 



Mr. Newton tigiired a fragmentary right ramus from this 

 deposit. Mr. Savin has kindly lent me the material collected 

 by him since 1882, namely, ten more or less imperfect man- 

 dibular lami and a fragment of a left maxilla with ^^ in 

 ])Iace ; these specimens came from the lower sandy part of 

 the deposit. Air. White has lent me a left ^ and a left i^^ 

 from the middle or " peaty " portion, while I found myself a 

 right 1^, with a little of the maxilla adheriisg to it, in the 

 npper bed or "Monkey gravel." 



The three lower cheek-teeth are jn-esent in one of Mr. Savin's 

 specimens, and they measure together 3"6 mm. In pattern 

 all the teeth found are indistinguishable from those of 

 A. sylvaticus. The material is, however, quite insufficient 

 for fine determination, and merely proves that the Cromerian 

 species was a member of the sylvaticus group. It may, later 

 on, prove to be identical with the form next described. 



2. Early Pleistocene. 



Apodemus lohitei, sp, n. 



" Mvs sp. allied to 31. sylvaticus" Ilinton, Proc. Geol. Assoc, xxi. 

 p. 492 (1910). 



Horizon. The High Terrace Drift of the Thames at Ingress 

 Vale, near Greenhithe, Kent. 



Characters. Size and dentition essentially as in A. sylvaticus. 

 Maxillo-palatine suture extending forwards to level of 

 antero-internal cusp of *^ ; incisive foramina terminating 

 behind slightly, but distinctly, in advance of the anterior root 



of "^-il. 



The only available material from this deposit is that in the 



