1. Berthella plumula. Internal shell; height (longest dimension) 1.5mm, from juvenile animal 2mm long. Spire, apart from final whorl, about a third of shell height, and aperture less than height, at this early growth stage. LWS. Menai Strait, April 2011.
2. Berthella plumula. Internal shell; height (longest dimension) 1.5mm, from juvenile animal 2mm long. Spire, apart from final whorl, about a third of shell height, and aperture less than height, at this early growth stage. LWS. Menai Strait, April 2011.

Berthella plumula. Internal shell; height (longest dimension) 1.5mm, from juvenile animal 2mm long. Spire, apart from final whorl, about a third of shell height, and aperture less than height, at this early growth stage. LWS. Menai Strait, April 2011.