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Project Noah Nature School
Shells flat on the back
These "cats eyes" are the trapdoors (operculums) of certain univalve molluscs, particularly turban shells and moon shels. The operculum covers the opening when the mollusc is exposed and protects it from drying out or being eaten. The shiny side is on the inside and the other flat side is white or brown.
Spotted on Nov 24, 2011
Submitted on Nov 24, 2011
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