Redescription of teracorals described by E. Eichwald in "Palaeontology of Russia"

Fifty-tree species of tetracorals from Eichwald's collection have here been revised, described and illustrated. Stratigraphic range: Ordovician through Lower Permian. Most names given by Eichwald have lost their priority (nomen oblitum), but the present writers ,suggest to keep them for the species which were not described after Eichwald's publication.