1. Berthella plumula. Internal shell; height (longest dimension) 5.5mm, from animal 13mm long. Large final whorl; rest of spire relatively very small. Yellowish shell mostly covered by white layer. LWS. Menai Strait, Wales. March 2011.
2. Berthella plumula. Internal shell; height (longest dimension) 5.5mm, from animal 13mm long. Large final whorl; rest of spire relatively very small. Yellowish shell mostly covered by white layer. LWS. Menai Strait, Wales. March 2011.

Berthella plumula. Internal shell; height (longest dimension) 5.5mm, from animal 13mm long. Large final whorl; rest of spire relatively very small. Yellowish shell mostly covered by white layer. LWS. Menai Strait, Wales. March 2011.