Epitonium trevelyanum

(Johnston, 1841); Johnston, 1841 ex Leach ms.

Description (shell):
In general appearance like that of other species of the genus but distinguished by the following: spire cyrtoconoid; a flat triangular spur near the adapical end of each costa, giving the spire a turreted profile; base of aperture angulated and forming a spout; 8-9 costae converge on thickening alongside columella.
Usually 14 costae on each whorl; each is bent towards surface of the whorl rather more than in Epitonium clathrus but less than in Epitonium turtonis. In the sutural region each costa curves down the spiral of the shell to join its neighbour. Between costae some spiral lines are often visible, as may also be a peripheral brown spiral band. Last whorl occupies about 40 % of shell height, aperture about a quarter.

Up to 20 x 10 mm.

Commonly without brown spiral bands.

The animal resembles Epitonium clathrus but has a more delicate foot and is paler.

Sandy bottoms 5-20 m deep.

The species ranges from the Mediterranean to Norway but records off the British Isles are few: off western Ireland and northern Scotland (Distr. E. trevelyanum).