12), a west Australian creature of the size of a mouse, which may be regarded as representing by itself a sub-family (Tarsipediinae), characterized by the rudimentary teeth, the long and extensile tongue, and absence of a caecum.
All leeches are very extensile and can contract the body to a plump, pear-shaped form, or extend it to a long and worm-like shape.
Each palpacle is a tactile filament, very extensile, without accessory filaments or nematocysts.
By the absence of one pair of upper incisors, the small size of the cheek-teeth and the very extensile character of the lips.
The mouth is small and tubular, furnished with a long extensile tongue.
The strong claws make a hole in the side of the ant-hill, and the insects are collected on the extensile tongue.
These captacula are of unequal length, highly contractile and extensile, easily thrown off and regenerated.
Between the long, extensile, worm-like tongue of the anteaters, essential to the peculiar mode of feeding of those animals, and the short, immovable and almost functionless tongue of the porpoise, every intermediate condition is found.
The first somite has become a prosthomere, and carries a pair of extensile antennae.