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
Anglican prayer beads additional separate and larger beads separating the groups. The number thirty-three signifies the number of years that Christ lived on the Earth, while the number seven signifies wholeness or completion in the faith, the days of creation, and the seasons of the Church year. The groupings are called "weeks", in contrast to the Dominican rosary which uses five groups of ten beads called "decades". The beads between are usually larger than the "weeks" beads are called "cruciform" beads. When the loop of beads is opened into a circular shape, these particular beads form the points of a cross within the