Shell money most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was "Dentalium shell", a species of long narrow marine shelled mollusk, a tusk shell or scaphopod. The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches. Farther south, in central California and southern California, the shell of the olive snail "Olivella biplicata" was used to make beads
Beadwork five centuries in the Americas. Today a wide range of beading styles flourish. Alongside the widespread popularity of glass beads, bead artists continue incorporating natural items such as dyed porcupine quills, shell such as wampum, and dendrite, and even sea urchin spines in a similar manner as beads. Wampum shell beads are ceremonially and politically important to a range of Eastern tribes, and were used to depict several important treaties between the Native peoples and the colonists, as in the case of the Two Row Wampum Treaty. In the Great Lakes, Ursuline nuns introduced floral patterns to tribes who quickly