I do > remember > the Compendium as having an error with its illustration of C. > sennottorum. By the way, I didn't wish to get on the wrong side of anyone with that statement. I could imagine the difficulty of making a text such as the Compendium of Seashells completely error free. With such a broad spectrum of world wide shells and controversies over shells that some people don't consider to be different species, a high degree of accuracy is next to impossible. Those who specialize in one particular group or location are probably almost always the ones who find possible errors.