bubble shell

bubble shell

noun
marine gastropod mollusk having a very small thin shell 
WordNet® 3.0, © 2006 by Princeton University.
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Encyclopedia Britannica
Encyclopedia

bubble shell

any of various marine snails of the order Cephalaspidea (subclass Opisthobranchia of the class Gastropoda). It characteristically has a thin, globular shell that may be embedded in the body of the animal.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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