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Mesoginella stilla (Hedley, 1903) Diagnosis: Shell
small, white or yellowish white, not strongly narrowed anteriorly; spire
low; aperture moderately narrow; lip denticulate along its whole length, moderately thickened
internally, thickest centrally; external varix present; siphonal notch
absent; posterior notch weak; ventral callus present; columella with
four strong plaits occupying slightly less than half the aperture, 4th
fold not remote. Size: Adults 4 – 5.5 mm in length. Distribution: Australian
Museum Collection: Taree, NSW, to Comparison: In
this species the lip denticles extend the entire length of the inside of the lip,
except for the posterior notch area. Denticles only develop on mature shells;
shells can have quite a thickened internal lip but still be immature and
lack the denticles. Fig. 1: HOLOTYPE. Off Port Kembla, NSW, in 63-75 fathoms (115-137 m) (C.016356)
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