Two dead marine mammals were discovered on Lobsterville Beach over the past weekend. A dead Atlantic dolphin measuring 91 inches was found along with a 94-inch long gray seal, according to Bret Stearns, director of natural resources at the Wampanoag Tribe of Gay Head (Aquinnah). Mr. Stearns said they investigated the sighting on Monday and concluded that the dolphin had died recently. The New England Aquarium was notified and no further action was taken.