Package, containing a lucky horseshoe wrapped in red thread, overlaying a paper image of a scene with St Martin, with outside of package a mass of red thread covering nine balls of light wood or paper: North America, Mexico, Mexico City, 1999

Fossil horseshoe crab, Mesolimulus walchi, in lithographic limestone, from the Jurassic Period of Solnhofen, Bavaria, Germany

Limulus sp., horseshoe crab, dried specimen

Limulus sp., horsehoe crab, dried specimen

Limulus polyphemus (Linnaeus, 1758), horseshoe crab, dried specimen

Fossil horseshoe crab, Rolfeia sp., from the Mississippian Epoch (early Carboniferous) of Mumbie Quarry, Dumfriesshire, Scotland