Scientists reported today that bones from a baby plesiosaur were recovered from an Antarctic island. The researchers said the animal's stomach area was well-preserved, including forked ribs, sometimes into three prongs, and numerous small, rounded stomach stones probably used to help maintain buoyancy or to aid digestion. The new fossil is one of the most complete of its type ever found. The skeleton was found in an area covered with volcanic ash, leading them to speculate that the plesiosaur was killed in an eruption, either by the blast or by ash dumped in the ocean.