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 clan mother has a certain string of wampum that serves as their certificate of office. When they pass on or are removed from their station, the string will then pass on to the new leader. Runners carrying messages during colonial times would present the wampum showing that they had the authority to carry the message. As a method of recording and an aid in narrating, Iroquois warriors with exceptional skills were provided training in interpreting the wampum belts. As the Keepers of the Central Fire, the Onondaga Nation was also trusted with the task of keeping all wampum records. Wampum