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Circular, almost like a poached egg. The peripheral part is striated.
We had stopped for lunch at a restaurant, enroute Galle from Mirissa, Sri Lanka. The restaurant had a beach attached. The tide was coming in. I ventured out for a very quick survey and took a few shoots. This is one invertebrate I saw along with some Chitons.
This is my 2200th spotting and I chose an unknown animal as a mark of my deep appreciation of PN for helping me learn about so many hitherto unknown (to me) species. Here is another one. Please, can anyone help with ID.