Minnesotastan found a strange photograph on a Japanese site with no information. Commenters looked around and suggested this is "sausage jelly", which is the egg case of the snail Polinices sordidus, commonly called the sordid sand snail or moon snail. Other photographs of sausage jelly do not show the eggs as hatched. Have you ever seen anything like this? Link
Minnesotastan found a strange photograph on a Japanese site with no information. Commenters looked around and suggested this is "sausage jelly", which is the egg case of the snail Polinices sordidus, commonly called the sordid sand snail or moon snail. Other photographs of sausage jelly do not show the eggs as hatched. Have you ever seen anything like this? Link
yes. IN MY NIGHTMARES!