"Orange Finger Sponge," ID as per Lamb and Hanby p. 68.
"Spaghetti Sponge," ID as per Lamb and Hanby, p. 62.
'Haliclona sp. A,' according to http://seanet.stanford.edu/RockyShore/MiscOther/index.html
This is a closeup of Halichondria panicea or Yellow-green Encrusting Sponge taken with my macrolens. On this site it's called Bread-crumb Sponge, but since Halichondria bowerbanki is known as Crumb of Bread Sponge, I think Yellow-green Encrusting Sponge is a better name.
This mustard-yellow sponge appears to be a Suberites species. It was growing on a rock in the lower intertidal zone and visible during a minus tide. It measured about 4" X 6" and was smooth like leather.
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...