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The operculum (the shell door) is a corneous plate (except in the genus Pila, where the operculum is calcified at the inside during the life of the snail), with a concentric structure and a nucleus near the parietal margin (close to the umbilicus).
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www.applesnail.net/content/anatomy/shell.php
www.applesnail.net/content/anatomy/shell.php
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Magical and large, operculum shell with deep coloration of olive green and burnt oranges are combined with 15k rose gold. Fantastic for either a man or woman, these cufflinks date to circa 1900. The buttons flip up for easy insertion and down for security.
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www.georgianjewelry.com/items/show/11178-operculum-shel...
www.georgianjewelry.com/items/show/11178-operculum-shell-rose-gold-cufflinks
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OPERCULUM shell earrings from Morning Glory Jewelry. Buy now for $110.00 ... OPERCULUM shell earrings, also called Shiva shell, set in silver gilt, 1-1/4". This is a sea shell also known as a Pacific Cat's Eye. View #V34765 $110.00...
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www.morninggloryjewelry.com/operculum-shell-earrings-p-...
www.morninggloryjewelry.com/operculum-shell-earrings-p-8242.html
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has yielded a shell of Ceratopea ung4is with the operculum in life position. ... Arkansas; A. Top view of shell and operculum, hypotype, USNM 177177, ...
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www.jstor.org/stable/1303025
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ABSTRACT-The only two known life associations of the shell and operculum of Maclurites Le Sueur, 1818, are described for the first ...
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www.jstor.org/stable/1306821
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Only one life association of the shell and operculum has been ... The base of the operculum and shell of that specimen are not ...
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jpaleontol.geoscienceworld.org/cgi/reprint/78/1/218.pdf
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The only two known life associations of the shell and operculum of Maclurites Le Sueur, 1818, are described for the first time. ... LIFE ASSOCIATION OF SHELL AND OPERCULUM OF CERATOPEA ULRICH, 1911 (ORDOVICIAN; GASTROPODA); Journal of Paleontology, January 1, 2004; 78(1): 218 - 220.
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jpaleontol.geoscienceworld.org/cgi/content/abstract/73/...
jpaleontol.geoscienceworld.org/cgi/content/abstract/73/6/1078
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Access to this underused prey appears to be made possible by morphological speializations of the neurocanium that allow Asemichthys to puncture the shells of its prey during mastication. Unpunched, the shell and operculum act as a barrier to digestion;
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www.sciencemag.org/cgi/content/abstract/241/4861/92
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round operculum in shades of orange and white with a dark spot of brown. Add nice color to shell crafts. ... Seashells for Arts & Crafts;
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www.seashellsandwood.com/Shells/ShellsO018.html
www.seashellsandwood.com/Shells/ShellsO018.html
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