Xenophora sp. fossils from Nicosia - Cyprus

Xenophora, commonly called carrier shells, is a genus of medium-sized to large sea snails, marine gastropod mollusks in the family Xenophoridae, the carrier snails or carrier shells. The genus Xenophora is the type genus of the family Xenophoridae.

Xenophora is also the name of the quarterly magazine of the French Conchologist Association

The name Xenophora comes from two ancient Greek words, and means "bearing foreigners", so-called because in most species the snail cements pieces of rock or shells to its own shell at regular intervals as the shell grows
From https://en.wikipedia.org/wiki/Xenophora

Photos by George Konstantinou