Hi Peter, According to "Founders of Early American Families" by Meredith B. Colket, Jr., Director, of the Western Reserve Historical Society, which was puyblished by The General Court of the Order of Founders and Patriots of America as a contribution to the Bicentennial of the United States of America, Cleveland, Ohio 1975: Mighill (Mighel) Cressey arrived in Salem (Mass.) 1649; was in Ipswich 1660; d. there Apr. 1670.It does not give the name of his ship.
I think I gave you the information from the "Cressey Family" by Ernest Woodbury Cressey which also does not give the name of the ship.
It is believed that Mighill arrived with Capt. Thomas Lothrop and the "Founders of Early American Families" by Meredith B. Colket, Jr.gives his name as Lathrop.It does not give additional info on Capt. Thomas since they list the 1st arriving Lathrop or Lothrop was Rev. John who arrived in "Griffin" in 1634.