Not necessarily a barrow, but a prehistoric "long mound" according to Coflein:
An elongated isolated mound aligned east - west. The mound is 24 m in length. At the east end the mound is 10 m wide and 1 m high with a slight hollow in the center of the highest point. The west end appears much eroded. What survives is 3 m wide and only 0.2 m in height. Some apparently in situ stone work may be the remains of some form of stone structure at this end of the mound.