GLANDULAR AREAS OF AUSTRALIAN JERBOA MICE. 
area contain elongated air-spaces. In some the air-space is 
confined to the portion of the hair enclosed by the follicle, and 
in others to the free portion of the hair. 
In regard to function of the gular pouch, Waite (2) suggests 
that it is used for storing food. Oldfield Thomas (4) considers 
this extremely unlikely and that the gland is probably of a 
sexually attractive nature. Wood Jones (1) says that the pouch 
is probably glandular and that observations on captive specimens 
have failed to provide any clue as to its true function. 
In all gular glandular areas the hairs are definitely oriented. 
When the area of reflected skin is small, the hairs are arranged 
centripetally and their free ends project towards the centre ; 
these hairs also tend to point ventrally and form an inverted 
cone when the animal rests on its hind legs. When the reflected 
skin is larger, the tips of the hairs are directed towards a point 
anteriorly. 
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Fig 1. 
Arrangement of hair on gular pouch of Notomys 
ventral and lateral views. Diagrammatic. 
This arrangement of hairs suggests a definite function. 
Their converging tips would enable sebaceous material from the 
base of the hairs to run together and form a droplet. The 
animal may use such droplets for its toilet. 
PODANOMALUS. 
Podanomalus has no external indication of a gular pouch ; 
the epidermis in the gular region is not hypertrophied and the 
dermis presents no unusual features. Numerous fatty and 
lymphoid areas are in some cases suggestive of degenerate 
glands. (PI. VIII, fig. 3.) 
The pre-sternal glandular area varies in size and shape, and 
except for a few fine, short hairs, it is almost entirely bare ; 
it has a granulated appearance. It is lower than the surface 
of the surrounding integument and is bounded by a thickened 
rim. In one specimen it measured 6 mm. by 25 mm. Micro- 
scopically the area appears to consist almost entirely of 
