Authority is given to the State of New Jersey, or, through it, to any commission, individual, corporation, or municipality, singly or collectively, designated by the legislature of said State, or by a commission appointed or authorized by said legislature, to improve the channels on the New Jersey seacoast, or any portion of said coast, or the waters adjacent thereto, lying between thirty-eight degrees fifty-six minutes and forty degrees twenty minutes north latitude, by dredging, or by the construction of piers, jetties, or breakwaters, or other river and harbor work of any description or nature adapted to attain the ends now purs