The Martha’s Vineyard Land Bank has signed a contract to purchase 41.1 acres on Chappaquiddick, including some 900 feet of shoreline on Cape Pogue Bay.

The acquisition will be added to its existing Three Ponds Reservation, bringing the total contiguous land area to 357.7 acres.

In an announcement on Monday, the land bank said the land, at the end of Jeffers Lane, would cost $4.95 million. The sellers are Judith Self Murphy, E. Baldwin Self Jr. and Karen Self Osler.