General lines of outer (1) and parietal (2) lips form obtuse angle, but outer lip on uneroded specimens flexes just before junction to make small acute adapical angle (3).
Shell height 16.2 mm, breadth 17.7mm. W. Anglesey, March 2014.
General lines of outer (1) and parietal (2) lips form obtuse angle, but outer lip on uneroded specimens flexes just before junction to make small acute adapical angle (3).
Shell height 16.2 mm, breadth 17.7mm. W. Anglesey, March 2014.