Keyhole-Urchin Small 320×278 Medium 640×557 Large 1024×891 Download Tiff Original 2400×2088 | (4.8 MB) Description A sea-urchin very similiar to the Sand Dollar, but has 5 "keyholes" through its shell. Keywords echinoidea, Sand dollar, sand-dollar Galleries Sea Urchins and Sea Stars Source: Sarah Cooper, Animal Life: In The Sea and On The Land (New York: Harper & Brothers, 1887) 69
