I am comparing juvenile specimens (50-75mm) labeled as Cymbium gracile
(Broderip, 1830) and Cymbium patulum (Broderip, 1830) and am having
difficulty differentiating between them with certainty. Standard
references, including Broderip's Species Conchyliorum, are not proving
particularly helpful, as they all illustrate fully adult specimens. Can
anyone help me with this