This genus of bryozoans is named Archimedes because of its corkscrew shape, in analogy to the Archimedes' screw, a type of water pump which inspired modern ship propellers. These forms are pretty common as fossils but they have been extinct since the Permian.
Archimedes were tubular-shaped zooids part of colonial animals. In life the individual animals formed spiral sheets that were attached to a central corkscrew skeletal structure. The whole structure would be attached to the seafloor or a shell. These bryozoans were stationary epifaunal suspension feeders. 
The live creature had a delicate calcareous lattice structure  representative of fenestrate growth forms, but in most fossils these latices have been destroyed, leaving only the spiral backbone.