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
Shell tools in the Philippines the ribs. Sections cut from these locations provide the thickest pieces of shell and the largest adzes. The shells of giant clams were fashioned into large spherical beads with holes drilled end to end at the center while pendants for the ear were ground from cone shells. Perforations were drilled at the center of the disk. Bracelets and anklets were both made from giant clams and cone shells. Shell bracelets made from the top shoulder of the body whorls of cone shells (Conus litteratus) are characteristic of the Late Neolithic Age. The natural spiral found along the shoulders of the