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Alaginella geminata (Hedley, 1912)

Diagnosis: Shell small in size, colourless transparent to opaque white, strongly narrowed anteriorly; spire medium height; aperture moderately narrow, constant width throughout; lip moderately thickened internally, with about 10 denticles, these stronger centrally; lip slightly flared posteriorly;  external varix present; posterior notch weak; columella with four strong plaits occupying slightly more than half the aperture.

Size: Up to 6 mm in length

Distribution: Australian Museum Collection:  Fraser Is., Queensland , to south-western WA, and possibly to North West Cape .  Known from 20-450 metres, rarely as a beach specimen.  Common.

Comparison: Distinctive within the genus because of its coarsely denticulate outer lip.

Synonymy: Marginella weedingi Cotton, 1944 is a synonym. It was described as being larger and narrower than typical specimens (Hewish in Wilson, 1994).

Figs. 1,2: HOLOTYPE; 16 miles east of Wollongong, NSW,  in 100 fathoms (183 m) (C.018007)