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
Two Row Wampum Treaty consideration and application of the principles of the Two Row Wampum. Larger disputes concerning extant treaties based on the Two Row Wampum, such as the Treaty of Canandaigua, remain unresolved through litigation and pending land claims. The Two Row Treaty contradicts the 15th Century papal Doctrine of Discovery, which decreed that Christian European nations could seize lands of non-Christian peoples whom they encountered in the New World. Modern legal rulings, including a 2005 decision by the US Supreme Court against Haudenosaunee plaintiffs, continue to hinge on that religious doctrine, and Two Row Treaty supporters promote the treaty as a legal