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The shell of Marginellidae is usually small, but varies in different species from minute to medium-sized. The external color of the shell can be white, cream, yellow, orange, red, or brown, and can be uniformly colored, or patterned in various ways. The protoconch is paucispiral. The lip of the shell is thickened, and can be smooth or denticulate.
The common name "Scotch bonnet" alludes to the general outline and color pattern of the shell, which vaguely resemble a tam o' shanter, a traditional Scottish bonnet or cap. The shell is egg-shaped and fairly large, 2 to 4 inches (5 to 10 cm) in maximum dimension, with a regular pattern of yellow, orange or brown squarish spots.
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The shell of this species grows up to 2.5 inches in length. It has a rough surface with many spiral cords crossing many axial ribs, resulting in a lattice or beaded pattern.
A live textile cone snail from Australia. The terminal helix of the shell of a cone snail is cone-shaped, and closed at the apex. When the empty shell is rolled over a long time by the waves in the breaking surf and coral rubble, the terminal helix of the shell breaks off or is gradually ground off, leaving the solid top of the shell intact.
Abbott R. Tucker & S. Peter Dance, Compendium of Seashells, A full color guide to more than 4,200 of the World’s Marine shells. 1982, E.P. Dutton, Inc, New York, ISBN 0-525-93269-0 Abbott R. Tucker, Seashells of the World: a guide to the better-known species , 1985, Golden Press, New York, ISBN 0-307-24410-5
"After the color image is established, the black silver-based image is dissolved away, leaving the color behind." #28 The Cathedral, Amsterdam, Holland Image credits: Detroit Photograph Company
Pinna nobilis, known by the common names noble pen shell and fan mussel, is a large species of Mediterranean clam, a marine bivalve mollusc in the family Pinnidae, the pen shells.