T.
Tentacula, the feelers of snails which inhabit shells.
Tesselated, checkered like a chessboard.
Testacea, the third order of worms, including those which are covered with a testaceous shell.
Testaceous, consisting of carbonate of lime and animal matter.
Tetragonal, four cornered.
Torose, swelling into knobs or protuberances.
Tortuosity, wreath, flexure.
Tortuous, twisted, wreathed, winding.
Transverse, placed across or crossways. When the breadth of a shell is greater than its length, it is called transverse.
Trapeziform, shaped like a trapezium.
Trigonal, having three angles.
Truncated, stunted, cut short or abruptly off at the end.
Tubercle, a little knot or pimple.
Tuberculated, knotted, pimpled.
Tuberosities, prominent knots or excrescences.
Tubular, in the shape of a hollow tube.
Tubulate, tubulous or hollow.
Tunicated, coated.
Turbinated, shaped like a top or pear.
Turgid, swollen.
U & V.
Valve, the whole of univalve shells, of shells in one piece; and the half of bivalves, or shells in two divisions, &c.
Varices, longitudinal ribs in univalve shells.
Variety, is when one species differs some little degree from that of another.
Vaulted, like the roof of one’s mouth.
Venter, the belly, situated in the body of the shell; being the most prominent part when the aperture is turned to the observer.
Ventral, belonging to the belly.
Ventricose, inflated, swelled in the middle.
Vermiform, worm-shaped.
Vertex, in the Patella the top or most prominent part, situated in general nearly in the middle. In the genus Bulla it is used for the apex.
Verrucose, warted.
Verticulated, whorled.
Umbilicated, having a depression in the centre like a navel.
Umbo, in bivalve shells, the round part which turns over the hinge.
Umbonate, bossed, having a raised knob in the centre
Undulated, waved, having a waved surface.
Ungulate, shaped like a horse’s hoof.
Unilocular, with a single chamber or compartment.
Univalve, shells consisting of one valve or piece.
Volutions, the wreaths or turnings of the shells of univalves.
Urceolate, swelling in the middle like a pitcher.
Vulva, a spatulated mark in several bivalve shells; formed when the valves are united on the posterior and anterior slopes.