spirula
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spir·u·la
(spĭr'yə-lə, spĭr'ə-) 
n., pl., -lae (-lē').
A small cephalopod mollusk of the genus Spirula, having a spirally coiled, partitioned internal shell.
n., pl., -lae (-lē').
A small cephalopod mollusk of the genus Spirula, having a spirally coiled, partitioned internal shell.
[Late Latin spīrula, twisted cake, diminutive of Latin spīra, coil. See spire2.]
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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