724 SCIURID^— CITELLUS 



these were referred provisionally to S. altaicus ( = eversmanni). 

 The Arctic Freshwater Bed lies beneath the well-known 

 Cromer Till, and it is correlated by most geologists with the 

 earlier Pleistocene horizons ; the occurrence in it of remains 

 of Citellus, a characteristically late Pleistocene genus, is one 

 of the many facts which lead the present writer to correlate 

 the deposit in question with the Third Terrace of the Thames, 

 which is one of the later Pleistocene deposits (Hinton, Proc. 

 Geol. Assoc, xxi., p. 493, footnote, 1910.) 



As regards the question of the species represented by the 

 British fossils our knowledge is still incomplete. Dr Forsyth 

 Major studied the material with great care many years ago, 

 and we believe that he concluded that at least two species 

 occur in the British Pleistocene ; unfortunately his results 

 were never published. The writer in turn has made some 

 progress with a similar investigation, but has not been 

 able to complete his work yet. In his view also there are 

 two species at least, both extinct, one being allied to the 

 living C. erythrogenys, the other more nearly related to 

 C. eversmanni.'] 



