These shells are from my seashell collection, many of which I found in Noumea, New Caledonia.
The shell in the foreground is a smooth spider conch - Lambis lambis. The common name in French in Noumea is "7 Doigts" (which translates to "7 fingers").
Strombidae, commonly known as the true conchs, is a taxonomic family of medium-sized to very large sea snails in the superfamily Stromboidea.
The family Strombidae includes the genera Strombus, Lambis, Tibia, and their allies. In the geological past, many more species existed than are now extant.
Strombid gastropods live mainly in tropical and subtropical waters. These animals are widespread in the Indo-West Pacific, where most species and genera occur. Nearly forty of the living species that used to belong to the genus Strombus can be found in the Indo-Pacific region. They also occur in the eastern Pacific and Western Atlantic, and a single species can be found on the African Atlantic coast. Six species of strombids are f...