Cochleate: spirally twisted like a screw or a univalve shell.
Its intestines were filled with small crabs and univalve shells.
Columella: An upright pillar in the center of most of the univalve shells, round which the whorls are convoluted.
The meaning of the univalve shell (Fig. 82) is also unknown.
To this exceedingly large and comprehensive order of gasteropods belong the great majority of univalve mollusks.
There appear to be three varieties, spiral, univalve, and bivalve.
On the other hand, Volutes and other genera of univalve shells, usually met with only in tertiary strata, occur.
Some of these are most vivid in their shapes and ray-like markings, particularly the univalve shells.
This may be either "univalve" or "bivalve" according as it consists of one or two pieces.
But before we go further, it may be well to point out the names given to different parts of a univalve shell.
A gastropod, especially one with a single shell, such as a snail, cone, whelk, abalone, or limpet. Univalves belong to the subclass Prosobranchia. Their shells are usually spiral and can hold the whole animal inside. Compare bivalve.