Keywords: Clavus cygneus 001.jpg en Clavus cygneus Melvill Standen 1897 ; family Drilliidae 1897 http //ia600208 us archive org/10/items/catalogueofhadfi23melv/catalogueofhadfi23melv pdf Melvill Standen 1897 Catalogue of the Hadfield collection of shells from the Lifu and Uvea Loyalty Islands Parts II pl XI 82 Melvill Standen other versions PD-old-70-1923 Clavus cygneus |