Documentation and systematic description of fossil Cretaceous sponges (porifera) from the Campanian...
Photograph of this fossil sponge from the Ordovician in Kentucky.
Fossil sponges from the Cambrian in Utah showing the spicules of which the skeleton is composed.
Image of part of a sponge from the Devonian in New York.
Photographs and information on Siphonia subglobosa and Siphonia tubulosa and some photomicrographs ...