A In-situ photograph of a thin yellow Verongid growing on an hexactinellid skeletal framework highlighted by the red arrow, 147 m deep. Sample GFOE3-23A B fragment of sponge observed under light microscope 100X; arrows show large dark cells potential spherulous cells (SC), and smaller dark cells, potentially granular cells (GC) C smear of a sample fragment observed with a light microscope at 400× magnification. Note the large ovoid choanocyte chambers (red arrow).