Others use a ring of buffalo horn, a crimson thread tied round each toe, the powdered teeth of a sea-horse, the skin of an eel, a hippopotamus tooth.
2
本税则所称“兽牙”,是指象、河马、海象、一角鲸和野猪的长牙、犀角及其他动物的牙齿。
Throughout the Nomenclature, elephant, hippopotamus, walrus, narwhal and wild boar tusks, rhinoceros horns and the teeth of all animals are regarded as "ivory".
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百科
河马牙
河马牙,英文名称ivory of hippopotamine 偶蹄目河马科动物河马的獠牙,外形呈弯曲的三角形,横切面可有圆形,方形或三角形,中间完全实心,无空隙,具有排列密集,略呈波纹状的细同心线.在纵切面上有较短的波纹·比重为1.8 0-1.95,平均折光率为1.544,一般重0.5~2公斤,表面具有较厚的珐榔质外层,比象牙致密,相对密度1.80~1.95,并有较密集的纹理,平均折射率1.545,硬度2.5~2.75。由于其牙是中空的,可用的实心原料不多,故多用于雕琢小的工艺品