When I am in the Leeward Islands, on the rocky islands of Nevis, St. Kitts, Montserrat and St. Eustatius, I fairly often find, in the beach drift, almost everywhere, at least a few really fresh-looking shells of Melampus monile and Tralia ovula.

There is no salt marsh habitat on these islands or anything remotely resembling that. Does anyone know where exactly these pulmonates live in rocky areas or on rocky islands? Do they live under small rocks at and above the high tide level? 

And where do they live on sand beaches that have only very dry habitat above the high tide level?

I have tried searching under dead seaweed at and above high tide level, but with no luck: the tropical sun always seems to have baked the weed until it is dry and crisp.

I also can't find live Truncatella, despite there being shells in the beach drift.

Any ideas for where these animals live on dry rocky islands?

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