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
Wampum also transfer personal history, and previous obligations of the deceased, e.g., the successor of a person killed in war may be obligated to avenge the death of the names previous holder, or care for the deceased persons family as their own. ... the Iroquoians (Five Nations and Huron alike) shared a very particular constitution: they saw their societies not as a collection of living individuals but as a collection of eternal names, which over the course of times passed from one individual holder to another. Just as the wampum enabled the continuation of names and the histories of persons, the