摘要：Members of four families are recognized from etched Wenlockian carbonates from the eastern Poland. The acrotretids are of special interest as being recorded in the Polish Silurian for the first time. Of two acrotretid species,Opsiconidion podlasiensis is described as new. The dorsal median septum of the genus Opsiconidion is discussed in detail.
其他摘要：Opisane ramienionogi pochodza z weglanowych skal osadowych (wenlok),z otwor6w wiertniczych: Sob6tka IG-1,z glebokosci 478-521 m oraz Widowo IG-1 z glebokosc! 583-594 m,w najbardziej na wsch6d polozone] czesci regionu podlaskiego (Podlasie Depression wig T
