rugose

It has a tripartite, weaponised tail, a few tentacles, thick, rugose armour and sharp triangular spines projecting from the shoulder and back.

Note the rugose look to the upper eyelids.

Shell fusiform, reddish brown, with whitish bands; smooth; spire plaited and striated; base rugose; pillar 4 plaited.

S. gramínea, L. Resembling the last; leaves linear-lanceolate, broadest above the base; pedicels widely spreading; seeds strongly but minutely rugose.—Becoming rather frequent.

You should be able to see the rugose dorsal crest along the length of the snout.