It is now nearly forty years since the presence of chlorophyl in certain species of planarian worms was recognized by Schultze.
The planarian worms that I have just been telling about are monsters.
These are planarian worms, and though not of prepossessing appearance generally, are extremely interesting animals to study.
Its like the extra legs and tails on the lizard, and the extra heads on the planarian.
Instead, much like the planarian cut in halves, it forms a whole animal, half size.
Flat against the stone and not easily perceived may be a chiton, a planarian worm, or a nudibranch.
Among the lowest forms of worms are the planarian worms, already alluded to as examples of the third grade of animal existence.
Any of various small, chiefly freshwater flatworms of the class Turbellaria, having soft, broad, ciliated bodies shaped like a leaf. Planarians have a mouth on their lower side that is often closer to the tail than the head, and a three-branched digestive cavity. If a planarian is cut into several pieces, each piece can grow into a whole new organism.