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	An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms  | 
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| by Paul S. Mikkelsen | |||
| Term | Definition | 
| TROCHOID or TROCHIFORM  | 
Having the form of a top; conical, with the base of the cone at the APERTURE; see also: TURBINATE. See other gastropod shapes. | |
 
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