what kind of animal lays eggs on a beach that look like white caviar?

I have found soft shelled eggs that are smaller than BB bullets (look like caviar) on a sandy beach in Margate NJ. This is on the ocean or an inlet (salt water). The eggs are soft shelled (not like a snake or turtle) and very small. The shell is clear and I can see a little green thing moving around inside (look like a jelly fish, but I know it is in the embryonic stage and thus wont look like the adult whatever it is). I found them at the back of a beach about 4 feet from the water at high tide. There were a series of small holes about 1 ½ inch wide 2 inches deep, each hole was filled about an inch with hundreds of these tiny eggs, none of the holes had been covered back up with sand. There is no way they came from a bird turtle or snake, and I don’t think they are horse shoe crabs because of the holes. it is july 8th when I found them if that helps with dates of when things lay eggs around here. Thanks

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1. grunion