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Dentimargo mayii (Tate, 1900) Diagnosis: Shell medium to moderately large, white, sometimes with three orange bands on the body whorl, biconic; spire tall; aperture moderately broad; lip thickened internally, denticulate internally in mature shells; external varix present; siphonal notch absent; posterior notch absent; columella with four strong plaits occupying more than half the aperture. Size: Adults 9-16 mm in length. Distribution: Australian Museum Collection: Sydney, NSW, to south-western WA, in 20-300 metres. Moderately common. Comparison: This
is the largest species in the genus.
The spire is tall, but the other members of the genus have an
even taller spire. Remarks: Only a small proportion of the specimens seen have the three orange bands on the body whorl; it is not clear whether they occur on only some shells, or have faded on dead specimens. The denticles inside the outer lip only occur on very mature specimens; some specimens with a moderately thickened inside of the outer lip are smooth. Fig. 1: Off Eden, NSW (C.315320)
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