The description of the representatives of the genus Labyrintholites is presented. The type species of the genus was published I. F. Sinzov in 1879. The considerable amount of the fossil material from the Santonian rocks found in the Saratov Volga Region has made it possible to substantiate the diagnosis of this genus within the order Hexactinosa and to present its taxonomic diversity within eight species. Among the Hexactinellids, the Labyrintholites are distinguished for their attachment to the substrate solid immobile elements.
