Specimen
from
Buenos
Ayres Maldonado. Valparaiso.
In. Lines. In. Lines. In. Lines.
Length from nose to root of tail 9 9 9 3 8 6
of tail Imperfect 6 0 6 6
of tarsus 1 7 1 7 1 7
East East Keeling
Falkland. Falkland. Island.
In. Lines. In. Lines. In. Lines.
Length from nose to root of tail 8 9 9 0 8 3
of tail Imperfect 6 0 6 6
of tarsus 1 7 1 7 1 7
Upon comparing the skull of the Valparaiso variety with that of a
British specimen of _Mus decumanus_, I could perceive no difference. A
skull from West Falkland did not differ, neither did the dentition of
the Keeling Island specimen above noticed. A perfect specimen of this
last I have not had an opportunity of examining.