@article{ERMS:SourceID:7142, author = {Bidder, G.P.}, journal = {Proceedings of the Royal Society}, pages = {61-76.}, title = {The Skeleton and Classification of Calcareous Sponges. }, url = {https://marbef.org/data/aphia.php?p=sourcedetails&id=7142}, volume = {64}, year = {1898} }