724 SCIURIDAZ—CITELLUS 
these were referred provisionally to S. altazcus (= eversmannt). 
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 Cvtedlus, 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. eversmannti. | 
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