Results 1 results found Old Danish Customs House, Christiansted National Historic Site, Christiansted, St. Croix, US Virgin Islands, Caribbean A green sea turtle (Chelonia mydas) in the sea grass, Saint Croix, U.S. Virgin Islands. The shell of a green sea turtle (Chelonia mydas) swimming to the surface, Saint Croix, U.S. Virgin Islands. The face of a green sea turtle (Chelonia mydas), Saint Croix, U.S. Virgin Islands. Christmas tree worms (Spirobranchus giganteus) on brain coral, Saint Croix, U.S. Virgin Islands.