Sentence Examples

  • Op., Operculum, or ventral lip. ov., Ovary.
  • Above the mouth is the lid (operculum), which varies in size from a small narrow process to a large heartshaped expansion.
  • But there are forms in which the involution is " hyperstrophic," that is to say, the turns of the spire projecting but slightly, the spire, after flattening out gradually, finally becomes re-entrant and transformed into a false umbilicus; at the same time that part which corresponds to the umbilicus of forms with a normal coil projects and constitutes a false spire; the coil thus appears to be sinistral, although the asymmetry remains dextral, and the coil of the operculum (always the opposite to that of the shell) sinistral (e.g.
  • Shell spirally coiled; operculum horny; intertentacular lobes absent.
  • Shell spirally coiled; epipodial tentacles present; operculum thick and calcareous.

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