I've not displayed many sponges on this blog with the only other instance being these specimens from the Waldron Shale. Below is a specimen from the Jurassic of Poland. I purchased it from a seller on E-bay. I think it's classified as a Cnemidiastrum rimulosum but I could be wrong.
This fossil came from near Zalas, Poland and comes from Oxfordian stage (Jurassic) rocks.