4, 5 & 6: moderate labial varix on almost all T. nitida over 15 mm high in Essex.

7: additional varix occasionally in Essex.

8: occasionally, costae replaced by multiple thin rows of low nodules, especially on larger shells in Essex; such specimens are unsuitable for identification by number of costae on body whorl.

Shell heights 1: 19,4 mm. 2: 21.6 mm. 3: 26.3 mm. Blackwater, Essex, England, September 2019, leg. S.Taylor.