Are these eggs? They look just like ring-doughnuts - each containing hundreds of tiny 'eggs'?
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Lacuna is a small sea snail and you are quite correct these are their eggs well spotted!
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Thank you so much for ID - to Mike Kendall and yourself - Trudy.
Now I must find the shell! I am a shell collector, so maybe there is one in my collection - I hope so.
My sister and I regularly stroll the strandline at Avon Beach looking for interesting sea creatures.
You have to look hard to find Lacuna species as they are not very big. The easiest way to find them (and a lot of other small molluscs) is to place around 2 litres of low-shore fucoid algae in a large bucket and agitate vigorously; then throw the weed away. Pour the residue from the bucket into a fine sieve. Wash the sieve contents into a bowl of water view with a little magnification and admire the diversity. If you feel inclined, there is a lot in the scientific literature on the method (including some work in West Cornwall). There is an extensive study of small molluscs in Scotland by Shelagh Smith, formally of the Royal Scottish Museum that uses the method.
Thank you for all that interesting information. I doubt very much that I have one in my shell collection now! But hunting I will go!
Wildpad did you ever find the Lacuna? I saw eggs like this, like small doughnuts on deposited seaweed a couple of years back nut didnt investigate too far into what laid them.
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