caddis worm

Oh, please, sir, you said there was another cousin called the caddis-worm.

Under natural conditions, the caddis worm has its persecutors, the most formidable of whom appears to be the Water beetle.

Their delicate terminal jointing, with a movable and crooked finger, is the caddis worm's equivalent of our hand.

This time, the caddis worm is given a few very leafy stalks of pond weed (Potamogeton densum) and a bundle of small dry twigs.

We see, therefore, that the caddis worm has not to trouble about hydrostatics when building its scabbard.