Hi Bob and Rosemary, Your Lambis sounds like an immature specimen that has not yet developed the spines on the lip. Is the lip rather thin and fragile? That would be another indication of immaturity. Murex duplex commonly exceeds 150 mm. In fact, an African Hexaplex that size almost has to be H. duplex. However, I wasn't aware that H. duplex occurred in southeast Africa. I thought it was restricted to northwest Africa?? I have received large specimens from Mauritania and Senegal. Regards, Paul M.