Flat, turned up at the sides, an hiatus for the passage of a byssus.
In Crenatula also there is no passage for the byssus, as in Perna.
The byssus is unknown to us, but the stuffs of Lyons are more valuable.
The animals swim like Lima, as above, and also spin a byssus.
It is found in great numbers attached to oysters by its byssus.
In the ventral margin there is an opening for the accommodation of a byssus.
In all these genera the foot is small, its retractile muscles numerous, and the byssus large.
A form of fungus known as byssus grows upon dead ova, and it is principally for this reason that they must be removed.
The use of a byssus is for attachment to any object to effect a temporary or permanent lodgment.
The accompanying cut shows Mytilus edulis, a common east-coast pelecypod, attached by its byssus to a piece of wood.