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A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer usually created by an animal or organism that lives in the sea. Most seashells are made by mollusks, such as snails, clams, and oysters to protect their soft insides. [1] Empty seashells are often found washed up on beaches by beachcombers.
The Scotch bonnet (Semicassis granulata) is a medium-sized to large species of sea snail, a marine gastropod mollusk in the subfamily Cassinae, the helmet shells and bonnet shells. 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 ...
1742 drawing of shells of the money cowrie, Monetaria moneta Cowrie shells The shells of cowries are usually smooth and shiny and more or less egg-shaped. The round side of the shell is called the Dorsal Face, whereas the flat under side is called the Ventral Face, which shows a long, narrow, slit-like opening (), which is often toothed at the edges.
Conch (US: / k ɒ ŋ k / konk, UK: / k ɒ n tʃ / kontch [1]) is a common name of a number of different medium-to-large-sized sea snails. Conch shells typically have a high spire and a noticeable siphonal canal (in other words, the shell comes to a noticeable point on both ends).
Tulip snail or tulip shell is the common name for eight species of large, predatory, subtropical and tropical sea snails from the Western Atlantic. These species are in the genus Fasciolaria . They are marine gastropod mollusks in the family Fasciolariidae , the spindle shells, tulip shells and their allies.
Shells may sometimes be confused with Thais haemostoma, but are paler and fatter (Yankson and Kendall, 2001). Rotula sp. (Echinodermata: West African sand dollar) have the appearance of flattened sea urchin. They are circular to heart shaped in outline and little more than the thickness of a coin in depth. A mat of flat lying spines covers them.
This results in different areas growing at different rates, and thus a coiling of the shell and a change in its shape - its convexity, and the shape of the opening - in a predictable and consistent fashion. [31] The shape of the shell has an environmental as well as a genetic component; clones of gastropods can exert different shell morphologies.