OEDEE OF INSECTIYOEA. 
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in their form. They differ much from one another in habits, hut 
they all agree in feeding in the same manner, and in possessing 
the same dentition. The principal genera are : the Hedgehogs 
properly so called, the Tanrecs, the Tupaias, and the Gymnures. 
Genus Hedgehog . — The Hedgehogs owe their name to the 
singular texture of their hair, which consists of real spines, 
capable of being thrown erect at the will of the animal. Their 
body is elongated, the limbs very short, and their paws have each 
five toes, armed with comparatively feeble claws. Their muzzle 
is pointed, and their olfactory organs are most highly developed. 
Fig. 2 2o . — Pyrenean Desman ( Galemys pyrenaicu). 
Their eyes are small and their range of vision limited. The tail 
is hare, thin, and very short. The teeth are thirty- six in number, 
twenty being in the upper jaw and sixteen in the lower. They 
have no incisors. 
The most curious feature in the economy of the Hedgehog con- 
sists in the faculty it possesses of rolling itself up in a hall, 
bringing the tail, paws, and head beneath the belly. After doing 
so, it is very difficult to compel it to open itself again. The Fox 
succeeds in this, hut only after long-continued efforts, and not 
without losing blood from both mouth and paws. Hogs are 
successfully trained to vanquish the resistance of the Hedge- 
hog. An infallible method of making the animal unroll is by 
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