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
Prayer beads Prayer beads Prayer beads are used by members of various religious traditions such as Hinduism, Buddhism, Christianity, Islam, Sikhism and the Bahá'í Faith to mark the repetitions of prayers, chants or devotions, such as the rosary of the Blessed Virgin Mary in Catholicism, and dhikr (remembrance of God) in Islam. Beads are among the earliest human ornaments and ostrich shell beads in Africa date to 10,000 BC. Over the centuries various cultures have made beads from a variety of materials from stone and shells to clay. The English word bead derives from the Old English noun "bede" which means a