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yes 4! but that's not the 4th
it's on the other side hahahahh
that one you encircles is just a rotten version of one of those gray ones :D

edit: cheers!
thanks for really reading and looking harder than harder :D ^__^ hahaha

..ha..ha, exciting ..!thanks

you're welcome
seems like you're the only one who got the question right :D

WOW! You have caught the essence of the oyster! Simply amazing👍This is the first time I have seen your work! I look forward to your future posts! Thank You for sharing.