figure 2: sponge gemmule with spicules
figure 3: types of sponge cells
figure 4: porocytes
figure 5: excurrent canal
figure 6: interior cells
figure 7: sponge on a silicone rubber substratum
figure 8: outcurrent canals
figure 9: pinacoderm
figure 10: gemmules
figure 11: sponges crawling in an aquarium
figure 12: closer view
figure 13: another close view
figure 14: more distant view
figure 15: dendritic sponges
figure 16: choanocytes with green fluorescent dye
figure 17: higher magnification
figure 18: porocytes and choanocytes
figure 19: Tethya sponge growing in a bottle
figure 20: closer view of Tethya
figure 21: red sponge
figure 22: yellow sponges