Squatter shell than T. reticulata, tapers strongly to apex.
1: all whorls convex.
2: pronounced, broad, labial varix; light brown with red/brown lines when covered by periostracum.
3: shell sculpture of transverse, oblong, rather than squarish, bosses.
4: white columella.
5: white siphonal canal with black/brown spot, see fig. 67.
6: semicircular, glossy, opaque, white parietal lip covers part of body whorl; less extensive than on T. reticulata.
7: periostracum only retained in grooves of sculpture on live specimens.
Dorset, England. April 2012.