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 white beads are "wampi" (white and yellowish) and "saki" (dark). The clams and whelks used for making wampum are found only along Long Island Sound and Narragansett Bay. The Lenape name for Long Island is "Sewanacky", reflecting its connection to the dark wampum. Wampum beads are typically tubular in shape, often a quarter of an inch long and an eighth inch wide. One 17th-century Seneca wampum belt featured beads almost 2.5 inches (65 mm) long. Women artisans traditionally made wampum beads by rounding small pieces of whelk shells, then piercing them with a hole before stringing them. Wooden pump drills