swell0
Visible through the walls of its egg case, this palm-sized swell shark (Cephaloscyllium ventriosum) appears ready to hatch. Often called "mermaid's purses", shark and ray egg cases are secured to the bottom using a variety of mechanisms. This one had cork-screwed filaments which connected it to a clump of algae. "Shale Island", Monterey Bay, California March 25, 2006
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