166 NORTHERN ZOOLOGY. 
claws, and less bushy tail. It seems to be the American representative of 
the A. (spermophilus) concolor, or jevraska of Siberia. The Tawny Marmot has 
been hitherto known only by Mr. Sabine’s account, in the Linnean Transactions, of 
one obtained on Captain Franklin’s first expedition. That description, owing to 
the imperfections of the specimen, is incorrect, in ascribing to the animal “ a 
tapering, sharp nose,” instead of a thick one, fully as obtuse as that of either the 
preceding or following species, and considerably more so than that of the Hudson’s 
Bay squirrel. The figure, also, in the Linnean Transactions, is incorrect, in the 
shape of the ears, and does not give so good an idea of the form of the animal, as 
Landseer’s excellent etching in this work. 
DESCRIPTION. 
Dental formula ; incisors , canines =, molars =; = 22. 
The incisors are straw-coloured, rounded anteriorly, without the vestige of a groove, and 
not so much compressed as the incisors of a squirrel, being fully as broad transversely as 
they are from before backwards. The upper ones have even cutting edges, the under ones 
rounded edges. In general form and structure, the upper grinders are similar to those of the 
Arct. empetra, but they are rather more compressed, the duplicature of the plate of the 
enamel from without inwards being more acute in proportion, The lower grinders have also 
the same general form, but the points are more distinct, and the anterior pair of points on 
each tooth rise in a more remarkable manner above the posterior pair. 
Skull.—The os-frontis is flat between the orbits as in the Quebec marmot; the nasal 
process, however, does not rise, but forms with the nasal bones part of a flat, elliptical arch, 
that extends from the occipital ridge nearly to the end of the nose, when it drops rather sud- 
denly. The margin of the orbits is a little raised. The distance between the orbits is only 
about 4 lines or 43 lines, being less than in the Arctomys Franklinii, and not above half the 
space that exists between the orbits of the Sciwrus Hudsonius. ‘The capacity of the cavity 
for containing the brain, is less in proportion than in the 4. Franklinii. 'The zygomatic 
process is broader than in the latter animal, and has a large, hollow surface, for the lodgment 
of the muscles. 
Body, a little shorter, but thicker than that of the Hudson’s Bay squirrel. Head roundish, 
depressed ; nose obtuse ; the naked septum and margin of the nostrils is of a blackish-brown 
colour. The end of the nose is covered with very short, grayish hairs ; the rest of the face, 
and dorsal aspect of the head, is coloured like the back, but has sometimes a darker yellowish- 
brown tinge. Whiskers, black, shorter than the head. Cheek-pouches, capable of containing 
a chestnut. Eyes, large. Ears, small, rounded, about a line high, situated above and 
behind the auditory opening, thick, and clothed with short hairs. There is no part of the 
auricle anterior to the auditory canal. 
The colour of the back is yellowish-brown, verging towards gray, intermixed with black 
hairs ; the fur is short and fine. On the sides the fur is a little longer, and has more of a 
