ARVICOLA ARENICOLA. 265 



in the neighborhood of Lisse, a village near Ley den, by 

 great numbers of Mice; four specimens have been preser- 

 ved in our Museum, apparently trapped, as the skulls are 

 violently cracked ; three are adult and one is a young. 

 Under the old stand of one of the individuals has been 

 written: »Arvicola qui a dévasté les champs en Hollaude 

 »daus les années 1836 et 1837 pris a Lisse, Hollande". 

 This very probably may have been written on that stand 

 by Mr. de Selys Lougchamps. This may be so or not, we 

 may be sure that this and the other three Lisse-specimens 

 are the very specimens described in 1841 by de Selys 

 Longchamps and therefore the type-specimens of Arvicola 

 arenicola de Selys Longchamps. His description is very 

 shortly termed (see above), although very appropriate, so 

 that a more detailed one must be drawn up. The reader 

 is prayed to consider that a good portrait of the species 

 cannot be given, as the animals have been stuffed and 

 were for more than GO years exposed to the influence of 

 light and dust in our Museum ! 



Arvicola arenicola de Selys Longchamps. 



i 



These photos represent the dentition enlarged Vj^ times; 

 they have been made so extremely correctly that every 

 further description is superfluous. 



Size between nivalis and arvalis; tail double the length 

 of that organ in arvalis; ears nearly hidden by the fur. 

 Each hair of upperparts of a bluish black, tipped with 

 reddish brown ; underparts with the hairs also bluish black. 



Notes from the Leyden IVIuseiiiTi, \'ol. XXIX. 



18 



