The name of this sea urchin found under ocean....The description of it is round, black, with spiney needle like protection over its body....One name I heard it been called before was Vana or want to but I'm unsure....

Sea Urchins types of sea urchins (http://www.seashells.org/identcatagories/seaurchins.htm)

Sea Urchins (http://www.coralreefnetwork.com/stender/marine/echinoderms/urchins/urchins.htm)