What is the identity of the chilazon, the creature from which techelet is produced? It's widely acknowledged that it is a snail by the name of Hexaplex trunculus (formerly known as Murex trunculus), pictured here at the Biblical Museum of Natural History. Only a small number of people dispute this - usually due to religio-sociological considerations. Still, it recently occurred to me that the very strongest argument for the trunculus is actually often overlooked.