
Columbella is a genus of small sea snails, marine gastropod mollusks in the family Columbellidae, the dove snails. Species within the genus Columbella include: According to the Indo-Pacific Molluscan Database, the following species names are also in current use, or have become synonyms : ...
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http://en.wikipedia.org/wiki/Columbella

• (n.) A genus of univalve shells, abundant in tropical seas. Some species, as Columbella mercatoria, were formerly used as shell money.
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http://thinkexist.com/dictionary/meaning/columbella/
Col`um·bel'la noun [ New Latin , dim. of Latin
columba a dove. So called from a fancied resemblance in color and form, of some species.]
(Zoology) A genus of univalve shells, abundant in tropical seas. Some species, as
Columbella mercatoria , were formerly used as shell money...
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http://www.encyclo.co.uk/webster/C/112
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