LEMMUS 195 



less evident sprinkling of blackish hairs above, its terminal 

 pencil whitish. 



Seasonal changes of colour inconspicuous. The winter coat 

 is acquired gradually in September or October, and owing to the 

 greater length of the ochraceous hair-tips the black markings, 

 particularly on the hinder part of the upper surface, are more 

 or less concealed. The young are born naked, pink, and Mind, 

 the eyes remaining closed until the eleventh day ; a full coat 

 resembling that of the adults in summer pelage, with the black 

 markings sharply defined owing to the shortness of the fur, is 

 acquired by the tenth day. In September and October the 

 young, like the adults, gradually assume the winter dress; but 

 occasionally all the cover-hairs are shed simultaneously, the 

 young then appearing for a time in a uniformly dusky garb 

 without any marked trace of the yellow parts. 



For external and cranial measurements, see tables at end of 

 volume. 



Range in lime. — Fossil remains of a form or forms not cer- 

 tainly distinguishable with available material from L. lemmus 

 occur abundantly in the late Pleistocene deposits of Western 

 and Central Europe. 



The following is a list of the materials which have passed 

 through my hands. 



A. GREAT BRITAIN. 



Somersetshire. Hutton Cave. 



One right and five left mandibular rami described by Sanford 

 (Q.J.G.S., 26, 1870, p. 125, pi. viii, figs. 3a, b), who referred them 

 to " L. norvegicus " var., saying, " they are, however, slightly 

 smaller [than those of the Norwegian Lemming], and the condyle, 

 with its neck, is slightly more slender in proportion to the size 

 of the jaw; we cannot, with our present means of iitformation, 

 ascribe to these differences a greater than varietal value." 



Taunton Museum. 



Somersetshire. Avenue's Hole, Burrvnglon Coombe. 



A large number of fragmentary skulls and mandibular rami 

 representing at least 125 individuals collected by the Bristol 

 University Spelseological Society (Hinton, Proc. Spel. Soc. Bristol 

 Univ., 1, p. 75, 1921; 2, p. 35, 1923; many other specimens 

 since obtained). 



Somersetshire. Cave at Uphill, near W eston-super-Mare. 



Three fragmentary mandibular rami and a detached m^; lent 

 by Dr. H. C. Male. 



Herefordsiure. Valley of the Wye ; Merlin's Cave near SymoniVs 

 Yat. 



Fragmentary skulls and mandibular rami representing at 

 least 110 individuals, collected by the Bristol University Spelapo- 

 logical Society (Hinton, Proc. Spel. Soc. Bristol Univ., 2, 1924- 

 1925, p. 157; many other specimens since obtained). 



