In property law, a conveyance by the owner O "To A and heirs of the body", without more, creates a fee tail for the grantee (A) with a reversion in the grantor (O) should the natural, lawful descendants of the grantee all die out.
In property law, a transfer from owner O to A and their lineal heirs alone creates a fee tail for A, with a remainder in O that reverts if A's direct descendants cease to exist.