Oval aperture is pointed adapically. Palatal lip meets parietal lip at c. 90º (1) but immediately curves (2) basewards; this feature is not clearly visible on all specimens.
3: anal sinus. 4: siphonal canal. 5: columella. 6: semicircular parietal lip. 7: rib with 10 palatal teeth.
Shell height 27.6 mm. Dorset, England. April 2012.