THE COMMON GRASS MOUSE 



445 



The skvill resembles that of M. a. exsul, but is smaller and has 

 relatively smaller bullae. 



The teeth are quite like those of normal agrestis, in}- being without 

 a small fourth inner angle. 



Exceptional variation: — White varieties are not common, but 

 there are a number of records of specimens exhibiting various degrees 

 of albinism, a few quite white with pink eyes, the rest in intermediate 

 conditions from cream to piebald. A black variety was recorded by 

 Southwell {Zoologist, 1890, 216). 



DIMENSIONS IN MILLIMETRES:— 



' Testis 2 mm. in diameter. 

 ' Testis 1 mm. in diameter. 



VOL. II, 



2 Testis 1 mm. in diameter. 

 » Testis 2 mm. in diameter. 



3 Imperforate. 

 « Imperforate. 



2 F 2 



