Do not ask me what it is - on the title it is clear that I have no idea about the origin of this outrage))
But it looks impressive.
Intelligent man in the comments under the name shurass told us what it is :))
This superfamily Lepadomorpha Pilsbr. Barnacles Lepadomorpha superfamily have a head, dressed limestone plates and bare or covered with calcareous scales stalk. Stalk serves for attachment to the substrate. Plate on the head or articulate or fused or lie independently. In some species the plate in some extent reduced. Sometimes stalk may be missing. Most of the species - hermaphrodites.