Did you perhaps mean one of these? nebula, neurula, nuchal, nulla
Definitions
Century Dictionary and Cyclopedia
- n. A genus of acephalous or conchiferous mollusks, formerly referred to the Arcidæ or ark-shells, now made type of family Nuculidæ. The size is small, and the shape resembles that of a beechnut, whence the name. There are about 70 living species, of which N. nucleus is typical, and numerous extinct ones, among which is N. cobboldiæ of the English crag.
GNU Webster's 1913
- n. (Zoöl.) A genus of small marine bivalve shells, having a pearly interior.
Examples
“This fossil resembles nucula, but it is not pearly in the interior, and its abdominal margin is smooth.”
“In the fragments brought home Mr. George Sowerby found a nucula, very much resembling some species of South America although not like any from Australia.”
Three Expeditions into the Interior of Eastern Australia, Volume 2
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