Keyhole-Urchin
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A sea-urchin very similiar to the Sand Dollar, but has 5 “keyholes” through its shell.
Galleries
Sea Urchins and Sea StarsSource
Sarah Cooper, Animal Life: In The Sea and On The Land (New York: Harper & Brothers, 1887) 69
Downloads
2400×2088, 4.8 MiB
1024×890, 216.4 KiB
640×556, 98.4 KiB
320×278, 27.1 KiB