Some sharks are live birthing, while other species lay an egg that has a leathery shell and is shaped squarish with a curly "string" off each corner. They almost resemble a purse with the strap cut. If my memory is correct, the theory is the string will curl around some form of structure and the egg will be secured and not bashed around in the surf. As for your pictures, I can't tell if they are eggs or not. I would monitor them and see if you get any development or growth for a week or two. If not, they aren't eggs.