horseshoe crab: large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse
arthropod: invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
ram's-head: orchid of northern North America having a brownish-green flower and red-and-white lip suggestive of a ram's head