A Swell Shark (Cephaloscyllium ventriosum) incubates at the Monterey Bay Aquarium. C. ventriosum’s large purse-like eggcases are smooth and a bit thick with tapering horns and long tendrils for hooking onto substrate. Its name comes from its ability to distend its stomach and swell its trunk to a near-spherical shape by swallowing water or air.