5IAM M A LIA .
soft; general colour gray faintly washed with yellow ; under parts of the body
grayish white; feet dirty white; tail dusky, paler beneath at the base:
the ears are large, distinctly emarginated behind, and appear to he almost
naked, hut, upon close examination, long and extremely fine hairs may he
observed. All the fur is gray at the base; the hairs of the moustaches
are numerous and very long, those nearest the mouth are white, the others
are black at the base and grayish beyond. The incisors are of a palish
yellow colour.
In. Lines.
6 6
. 2 10 . 1 4
Length of tarsi (claws included)
of ear • . •
W idth of ear . . •
To. Lines. 1 I
0 7
0 74
Length from nose to the root of tail
of tail . . . .
from nose to ear
Habitat, Chile, {September.)
This species is about one-third the size of tlie last, it differs moreover in being
gray instead of brown, and in having the posterior margin of the ear emarginated ;
the tail is also rather shorter in proportion.
The skull* is figured in Plate 33, fig. 1, o, and 1, b ; and fig. 23, a, Plate 34.
Its length is 1 inch, 41 lines ; width 9p lines ; length of nasal hones Q lines ; distance
between fore part of incisors and the front molar (upper jaw) 5 lines ; longitudinal
extent of the three molars of upperjaw 3 lines; length of auditory bullæ
5i lines ; length of ramus of lower jaw (see Plate 33, fig. 1, c,), without incisors,
11.). lines. Fig. 23, c, Plate 34, represents the inner side of a ramus of the lower
jaw : fig. 1, d, Plate 33, is the lower jaw seen from above : fig. 23, b, Plate 34, is
the same seen from beneath. This view is given to show the position of the
descending ramus of the lower jaw—that it springs from the outer side of the
alveolar portion, as in a great portion of the South American Rodents, such as
Dasyproda, 3Iyopotamus, Echimys, Chinchilla, and also in that genus found in the
W estlm ,ian islands, Capromys. Fig. 1, e, Plate 33, represents the molar teeth
of the u,. )er jaw, aud fig. 1 ,/, those of the lower.
species is abundant on the dry hills, partly covered with bushes,
near Vidparaiso.”—D.
* Tho ;11 is, unfoi-tunately, imperfect, the hinder portion is injured, and the arches which enclosed the
ant-orbital openings arc broken.