And, by the way, they cling to the
rock, when they turn back their operculum, for this operculum seems
like a lid; in fact this structure represents the one part, in the
stromboids, of that which in the bivalves is a duplicate shell. The
interior of the animal is fleshy, and the mouth is inside. And it is
the same with the haemorrhoid, the purple murex, and all suchlike
animals.
Such of the little crabs as have the left foot or claw the
bigger of the two are found in the neritae, but not in the stromboids.
are some snail-shells which have inside them creatures resembling
those little crayfish that are also found in fresh water. These
creatures, however, differ in having the part inside the shells But as
to the characters, you are referred to my Treatise on Anatomy.
5
The urchins are devoid of flesh, and this is a character
peculiar to them; and while they are in all cases empty and devoid
of any flesh within, they are in all cases furnished with the black
formations. There are several species of the urchin, and one of
these is that which is made use of for food; this is the kind in which
are found the so-called eggs, large and edible, in the larger and
smaller specimens alike; for even when as yet very small they are
provided with them.
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