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.
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.
As indicated in the accompanying illustration, the long-snouted phalanger is arboreal in habits, extracting honey and probably small insects from long-tubed flowers by means of its extensile tongue.
The strong claws make a hole in the side of the ant-hill, and the insects are collected on the extensile tongue.
The first somite has become a prosthomere, and carries a pair of extensile antennae.