![China Chengjiang Lower Cambrian Allantospongia mica Rigby and Hou 1995, 33 mm](https://a4.pbase.com/g10/41/984841/3/133895653.W6TUMQRi.jpg) China Chengjiang Lower Cambrian Allantospongia mica Rigby and Hou 1995, 33 mm |
![Utah Middle Cambrian Choia](https://a4.pbase.com/g10/41/984841/3/133896240.9REHWhMP.jpg) Utah Middle Cambrian Choia |
![Diagoniella](https://a4.pbase.com/g10/41/984841/3/153050864.uqAlV1WA.jpg) Diagoniella |
![Utah Middle Cambrian Diagoniella](https://a4.pbase.com/g4/41/984841/3/133896455.C5ZISFot.jpg) Utah Middle Cambrian Diagoniella |
![A group of Crummillospongia purse sponges with alga and hylothid](https://a4.pbase.com/g10/41/984841/3/167299126.WSDNFwvy.jpg) A group of Crummillospongia "purse sponges" with alga and hylothid |
![Crummillospongia 1.jpg](https://a4.pbase.com/g9/41/984841/3/153050863.NkHRuHBL.jpg) Crummillospongia 1.jpg |
![Leptomitus bellilineata, 155 mm individual, Marjum Formation, Middle Cambrian, Millard County, Utah](https://a4.pbase.com/g10/41/984841/3/133896835.lkh0lzMu.jpg) Leptomitus bellilineata, 155 mm individual, Marjum Formation, Middle Cambrian, Millard County, Utah |
![Morocco Ordovician Pirania](https://a4.pbase.com/g4/41/984841/3/133896850.IzqTSN9Z.jpg) Morocco Ordovician Pirania |
![Pirania, Fezouata](https://a4.pbase.com/g12/41/984841/3/169808029.DLErEcKV.jpg) Pirania, Fezouata |
![Pirania, Fezouata, 20 mm](https://a4.pbase.com/g12/41/984841/3/169808030.CjkCDCwa.jpg) Pirania, Fezouata, 20 mm |
![Undescribed sponge, 30mm across from the Ordovician of Wales](https://a4.pbase.com/o3/41/984841/1/133896874.lT49DqnJ.11WBSponge30mm.jpg) Undescribed sponge, 30mm across from the Ordovician of Wales |
![New York Ordovician sponge](https://a4.pbase.com/g4/41/984841/3/133896926.AYqdeOkQ.jpg) New York Ordovician sponge |
![New York Ordovician sponge](https://a4.pbase.com/g4/41/984841/3/134527522.DJSUaBQ6.jpg) New York Ordovician sponge |
![Sponges New York 1.jpg](https://a4.pbase.com/g9/41/984841/3/153050867.DmwD0bNp.jpg) Sponges New York 1.jpg |
![Sponges New York 2.jpg](https://a4.pbase.com/g9/41/984841/3/153050868.nSNHQUcr.jpg) Sponges New York 2.jpg |
![Sponges and orthocones.jpg](https://a4.pbase.com/g9/41/984841/3/153050869.HVi4DMMp.jpg) Sponges and orthocones.jpg |
![Astraeospongia 42mm, Silurian, Tennessee, showing stellate spicules](https://a4.pbase.com/g12/41/984841/3/171459953.5VQhh8VT.jpg) Astraeospongia 42mm, Silurian, Tennessee, showing stellate spicules |
![A Lower Devonian sponge from Bundenbach, Germany, Retifungus](https://a4.pbase.com/g4/41/984841/3/134528166.EBij4jLy.jpg) A Lower Devonian sponge from Bundenbach, Germany, Retifungus |
![Devonian Retifungus in X-radiograph](https://a4.pbase.com/g4/41/984841/3/134818911.MT3fbRvC.jpg) Devonian Retifungus in X-radiograph |
![Hydnoceras, a 95 mm hexactinellid sponge from the Late Devonian Chemung Group of New York](https://a4.pbase.com/g12/41/984841/3/170880879.CimvyaQn.jpg) Hydnoceras, a 95 mm hexactinellid sponge from the Late Devonian Chemung Group of New York |
![Lower Carboniferous Bear Gulch sponge, Montana, USA](https://a4.pbase.com/g4/41/984841/3/134527591.dxVxuJlH.jpg) Lower Carboniferous Bear Gulch sponge, Montana, USA |
![Glass Mountains sponges, Permian, West Texas](https://a4.pbase.com/g10/41/984841/3/167295557.EUr1D9OW.jpg) Glass Mountains sponges, Permian, West Texas |
![Craterospongia concentrica, Middle Jurassic, Horn Park Quarry, Beaminster](https://a4.pbase.com/g12/41/984841/3/170881024.fIk9Ra8X.jpg) Craterospongia concentrica, Middle Jurassic, Horn Park Quarry, Beaminster |
![Cretaceous Farringdon sponge](https://a4.pbase.com/g4/41/984841/3/134818916.tuSXEF6K.jpg) Cretaceous Farringdon sponge |
![Cretaceous Farringdon sponge](https://a4.pbase.com/g4/41/984841/3/134818939.cc447LLV.jpg) Cretaceous Farringdon sponge |
![Cretaceous Raphidonema](https://a4.pbase.com/g4/41/984841/3/134818944.j0tNuM1L.jpg) Cretaceous Raphidonema |
![Peronidella ramosa, 7 cm, Farringdon Sponge Gravels, Berkshire](https://a4.pbase.com/g10/41/984841/3/167295555.gzYjEWd2.jpg) Peronidella ramosa, 7 cm, Farringdon Sponge Gravels, Berkshire |
![Peronidella , 58 mm, Faringdon sponge gravels](https://a4.pbase.com/g10/41/984841/3/167304425.TZMkpwJq.jpg) Peronidella , 58 mm, Faringdon sponge gravels |
![Sponge from the Flamborough Sponge Bed, Sewerby](https://a4.pbase.com/g13/41/984841/3/173621409.0538d54a.JPEG) Sponge from the Flamborough Sponge Bed, Sewerby |
![Seliscothon planum 105mm, Upper Chalk. Sewerby, Yorkshire, UK.](https://a4.pbase.com/g4/41/984841/3/145538498.I3SVpS6f.jpg) Seliscothon planum 105mm, Upper Chalk. Sewerby, Yorkshire, UK. |
![Siphonia (Pachycalymma) subglobosa 165mm, Upper Chalk. Sewerby, Yorkshire, UK.](https://a4.pbase.com/g4/41/984841/3/145538499.9Upw3WEN.jpg) Siphonia (Pachycalymma) subglobosa 165mm, Upper Chalk. Sewerby, Yorkshire, UK. |
![Siphonia koenigi 105mm, Upper Chalk. Sewerby, Yorkshire, UK.](https://a4.pbase.com/g4/41/984841/3/145538500.KtEZRYK5.jpg) Siphonia koenigi 105mm, Upper Chalk. Sewerby, Yorkshire, UK. |
![UK Cretaceous Chalk Porosphaera](https://a4.pbase.com/g4/41/984841/3/145538487.99KcuuF6.jpg) UK Cretaceous Chalk Porosphaera |
![UK Cretaceous Chalk Porosphaera](https://a4.pbase.com/g4/41/984841/3/145538488.EnRwd5iM.jpg) UK Cretaceous Chalk Porosphaera |
![Sowerby sponges.jpg](https://a4.pbase.com/g10/41/984841/3/167295556.uZNjuKjW.jpg) Sowerby sponges.jpg |
![rooted sponge 1.jpg](https://a4.pbase.com/g10/41/984841/3/167295561.l1odibg2.jpg) rooted sponge 1.jpg |
![Hannover sponge top view-6.jpg](https://a4.pbase.com/g10/41/984841/3/167295562.iAKYdS4V.jpg) Hannover sponge top view-6.jpg |
![Hannover coelo 1-5.jpg](https://a4.pbase.com/g10/41/984841/3/167295564.DjY0Gg0x.jpg) Hannover coelo 1-5.jpg |
![Germany Cretaceous sponge detail](https://a4.pbase.com/g4/41/984841/3/134818988.VQUE4ccu.jpg) Germany Cretaceous sponge detail |