直式弹壳；圆柱式弹壳

патрон с цилиндрической гильзой

贝壳串珠由磨光后的贝壳制成的穿成链或带状物的小圆柱形珠子，早先某些美洲土著民族用其作为货币与珠宝或用于部落之间礼仪交换之物

Small cylindrical beads made from polished shells and fashioned into strings or belts, formerly used by certain Native American peoples as currency and jewelry or for ceremonial exchanges between groups.