This was a freshwater sponge, but the ID is a guess at this point.
Nice specimen from Bill Grossman
Not sure of what species live in the area. Needs investigation.
Collectors obtained several large and healthy heads.
Just off tip of thumb. Pale cylinder
This Haliclona (possibly H. permollis) or Purple Intertidal Sponge was growing on a huge boulder visible during the minus tide. It covered part of the rock in patches, with its little volcano-like holes.
Sponges are animals of the phylum Porifera (/pɒˈrɪfərə/; meaning "pore bearer"). They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and which often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most...