Cystiscus alternans (Pritchard & Gatliff, 1898)
Shell minute, colourless transparent to opaque white; spire concealed by
outer lip callus; outer lip thickened internally, smooth; external varix
absent; siphonal notch absent; posterior notch absent; lacking collabral
parietal callus ridge; columella multiplicate, with four strong plaits
and four weak lirae above.
Size: 1-2 mm in length
Resembles G. nympha in
size and shape, but that species has a strong external varix and the
outer lip is dentate internally.
Synonymy: A synonym is Marginella multiplicata Tate & May, 1900 (Hewish in Wilson, 1994).
The record of this species in NSW is based on one worn specimen
Copyright Des Beechey 2004