Strange grey blobs on a razor shell

Strange grey blobs on a razor shell

Observation - Strange grey blobs on a razor shell - UK and Ireland. Description: I found this on the beach on Sunday. The razor shell isn't too hard to ID, but I'm more intrigued by the grey blobs. They look like some kind of egg. I also saw the same blobs on other objects. There were a lot of shells on the beach which looked like

I found this on the beach on Sunday. The razor shell isn't too hard to ID, but I'm more intrigued by the grey blobs. They look like some kind of egg. I also saw the same blobs on other objects. There were a lot of shells on the beach which looked like they might have been washed up in recent storms.