“Sponges.
“We find three kinds of sponges mentioned; the first are thick, very hard, and rough, and are called tragi: the second are thick, and much softer, and are called mani: of the third, being fine, and of a closer texture, tents for sores are made; this last is known as Achillium. All of these sponges grow on rocks, and feed upon shell and other fish, and slime.
“It would appear that these creatures, too, have some intelligence; for, as soon as ever they feel the hand about to tear them off, they contract themselves, and are separated with much greater difficulty: they do the same also, when the waves buffet them to and fro. The small shells that are found in them, clearly show that they live upon food; about Torone it is even said that they will survive after they have been detached, and that they grow again from the roots which have been left adhering to the rock. They leave a colour similar to that of blood upon the rock from which they have been detached, and those, more especially, which are produced in the Syrtes of Africa.”
Olaus Magnus gives us the accompanying illustration of Zoophytes and Sponges. Of the latter, he says:—“Sponges are much multiplied near the Coasts of Norway;
the nature of it is, that it agrees with other living creatures in the way of contracting, and dilating itself: yet some are immovable from rocks, and if they be broken off at the Roots, they grow again; some are movable from place to place; and these are found in huge plenty on the foresaid shores. They are fed with mud, small fish, and oysters. When they are alive, they are black, as they are when they are wet.”
