Some pics of live shells with natural backgrounds ...
First: a confession: these look like in situ pics, but are not: they are taken back home, in a small photographic aquarium, in which has been placed a "live rock" collected at the same time and place as the shell: a filter, cooling device, and a few other tricks are used to get the desired pic!
A lovely specimen of C. fuscodentata from the western side of False Bay, 12m depth
Superficially similar in appearance, this specimen of C. fuscorubra, came from the cold west coast, near Hout Bay, 30m depth.
Two specimens of Trivia ovulata, from the Cape Agulhas area also show very variable mantle patterning as well as texture differences. 15-30m depth