Lewis's moon snail Neverita lewisii (Euspira lewisii) We could watch as the mantle retracted into the shell over the course of about 30 seconds.
inverts.wallawalla.edu/Mollusca/Gastropoda/Prosobranchia/...
Edmonds Beach walk during -2.5 foot low tide of 7 June 2016
edm20160607 060
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