Horridge, George Adrian2019-08-132019-08-130028-0836http://hdl.handle.net/1885/165017ALTHOUGH it is at first sight unlikely that a crab should take note of the direction of the Sun's movement directly, two lines of evidence already suggest this conclusion. Crabs follow with their eyes the movements of a striped drum which is revolved around them at speeds even lower than one revolution per day1, and several species of lower Crustacea2 as well as the Pacific shore crab H emigrapsus3 utilize some feature of the path of the Sun as a basis for directional escape movements in relation to the local direction of the sea.2 pagesapplication/pdfen-AU© Nature Publishing Groupcrabsuncrab Carcinuseyesmovement1965-09-25