Trilobite.
Tridacna gigas, the giant clam, is the larges species of seashell.
trilogy, Trinity,triplets,triples, and most things whose name starts with the letters tri.
Arabic, meaning "seashell"
i seeshells or i seashells
A cockle shell
Trifle
Trivial.
Some kinds of crafts one can make with seashells are: seashell frames, seashell chimes, seashell angels, seashell collages, seashell lamps and seashell mosaics.
chumash represents "bread maker" or "seashell people"
tricle triangle tripod
Triplicate
The scientific or taxonomic name would be Rosa'KORshell'.