Here are some pics of the Tropical Scorpion Shell which my father found while digging a hole for a fence post and I had always thought was around 1970 at the same property that I still live at now. However looking more closely at the bottom I see it has been written on that it was found in 1964 at a previous property that my parents lived at.
It was a museum which identified what it is but looking online it would appear to suggest that it's a sea animal rather than a spider despite it's name.
Imagine having a nice relaxing swim in the sea and one of these things unexpectedly finds it's way into your swimming trunks or attaches it's self to your face.