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These organisms were spotted on a rock at Governors Bay in Queen Charlotte Sound in August 2015.

They were flat jelly-like discs of a bit less than 1 cm in diameter.  Although they were observed on a submerged rock, they were only just below water level and could possibly have been exposed at low tide.

They are the eggs of the slipper limpet Sigapatella novaezelandiae. The adult animal is very round and it is often covered with a softish dark covering (the periostracum). When the animal dies the shell has a ledge on it which makes it look a bit like a slipper.

Read more about this critter.