CRICETINA 383 
Journ. Geol. Soc., xxvi., 1870, 128, pl. viii. fig. 6; and Proc. 
Somerset. Arch. and Nat. Fist. Soc., xv., 1868-69, 56, fig. 6, 
1870) to Mus songarus, a form described by Pallas (Rezse, 
1773, ii., 703, pl. B., 1) from the river Irtisch, Siberia, but 
now placed in the genus Phodopus (Miller, Smzths. Misc. 
Coll, 12th Jan. 1910, 498; Hollister, Journ. czt., 29th Nov. 
1912, 3). The Somerset specimens cannot, however, be 
synonymised with P. sungorus, and need a new name. They 
may be appropriately known as Phodopus sanfordi, and thus 
form an interesting addition to the British fauna. Phodopus, 
which is in external form and teeth less highly modified than 
Cricetus, is known also from the Altai District (P. crepidatus of 
Hollister),and North-eastern Mongolia (P. campébelli of Thomas). 
The Cvrzcetine are, like the pikas, of peculiar interest, 
being ancient generalised forms which have retained primitive 
~) 
S= Hes 

(1a) (2) (2a) 
Fic. 54.—CHEEK-TEETH OF Crice/us cricetus (crown view ; five times life size); A, unworn; B, 
slightly worn ; 1, Ia, right upper ; 2, 2@, left lower. From Miller’s Catalogue of the Mammals 
of Western Europe. (By kind permission of the Trustees of the British Museum of Natural 
History. 
characters, suggestive of the probable development of the 
more highly specialised Wecrotine and Murine from a cricetine- 
like ancestor. Their cheek-teeth are rooted, and, as in the 
Murine, the crowns are tubercled, but the arrangement in 
the upper jaw is one of two, not three, rows. As the tubercles 
wear down, a triangular, microtine-like pattern is revealed. 
The Cricetines, like many other groups represented in 
extra-arctic regions of both hemispheres, have no widespread 
form identical or representative in both. They are older 
than the existing land connections, and their present absence 
