138 
POUCHED JERBOA MOUSE. 
DESCRIPTION. 
Body, rather stout ; head, of moderate size ; nose, moderate, although 
the skull exhibits the proboscis extended five or six lines beyond the 
insertion of the incisors. 
The whiskers (which proceed from the nose immediately above the upper 
edge of the orifices of the pouches) are numerous, rigid, and longer than 
the head ; ears, of moderate size, ovate, and very thinly clothed with short 
hairs ; the feet are thickly clothed with short hairs to the nails, which are 
free ; short hairs also prevail on the soles and between the toes ; fore feet, 
rather stout, but short ; they have each four toes and the rudiment of a 
thumb, the latter covered by a conspicuous nail ; nails, short, slender, and 
curved ; second toe from the thumb longest, first and third nearly of equal 
length, and fourth shortest. 
Hind legs, very long ; the hind feet have each four toes, the two middle 
ones nearly of equal length, the first a little shorter, and the fourth, placed 
behind like a thumb, much the shortest ; nails, nearly straight, sharp 
pointed, and grooved on the under surface ; tail, rather stout — in the dried 
specimen it is round at base and much compressed, showing that its 
greatest diameter is vertical ; it is thickly clothed with short hairs for two 
thirds of its extent, when the hairs gradually increase in length till they 
approach the extremity, at which they are so long as to present the 
appearance of a tuft-like brush. The fur is very soft and silky, like that 
of the flying-squirrel ; the hairs of the tail are coarser. There are two 
abdominal and two pectoral mammas. 
In the upper jaw the incisors are rather small and weak ; all the molars 
have simple crowns, which are more elevated on the interior than on the 
exterior edges ; the anterior molar is nearly round, and almost of the same 
size as the two next molars, which are somewhat oval and are placed with 
their longest diameter transversely to the jaw ; the fourth molar is the 
smallest and is nearly round. 
In the lower jaw the three anterior molars are nearly of equal size, and 
are almost alike in shape ; the fourth corresponding with the last molar 
on the upper jaw ; there is a little depression in the centre of the crowns 
of the molars, and a slight ridge around the outer edges. 
COLOUR. 
Head, ears, back, and a stripe on the thigh from the root of the tail, 
light brown, the hairs on the back being plumbeous at the roots, then 
yellow slightly tipped with black. Whiskers, black, with a few white 
