Sentence Examples


  • Thus the arms are reduced to a single pair and possess no tentacles, there is no definite operculum, and the -alimentary canal is vestigial.
  • 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.
  • The gonotheca is formed in its early stage in the same way as the hydrotheca, but the remains of the hydranth persists as an operculum closing the capsule, to be withdrawn when the medusae or genital products are set free (fig.
  • 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.

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