Aulocopium in omringend gesteente

In the border-region of the Netherlands and Germany and near Zwolle four specimens of anthaspidellid sponges, embedded in silicified ordovician limestone, have been collected in the last years. Both authors regard the occurrence of the three specimens of Aulocopium aurantium and one of Hudsonospongia cf. cyclostoma as a matter of importance, the specimens being the only known ones among about 2.600 inventoried specimens of Aulocopium in Dutch collections. They hope to gain more information about the accompanying fossils by new reports from collectors.