Tritia incrassata odd numbers; Tritia reticulata even numbers.
1. Transverse oblong bosses.
2. Low, squarish bosses.

3. Strong labial varix.
4. No labial varix.

5. Glossy, opaque, white parietal lip extends onto body-whorl.
6. Semicircular, glossy, opaque, white parietal lip covers large part of body-whorl.

7. White columella and siphonal canal. Dark spot within canal.
8. White columella and siphonal canal. No dark spot within canal.

T. incrassata H. 10.5 mm, Portland, Dorset, England, April 2012.
T. reticulata H. 27.6 mm, Portland, Dorset, England, April 2012.
: flic.kr/p/2oiGpnC
Sets of OTHER SPECIES:
/