Detholiad o Morris, L., 1748. Plans of Harbours, Bars, Bays and Roads in St. George's Channel. Mae'r detholiad (tudalen 40) yn disgrifio nwyddau naturiol Biwmares, yn cynnwys amrywiol fathau o gregyn deuddarn.

Mae'r detholiad yn darllen fel a ganlyn: “Here is Plenty of Corn, Butter and Cheese; and at Penmon they have a good Herring fishery.

All this Coast abounds with Oysters: Those of Penmon are fat and large, and famous for Pickling. They also have Muscles, Cockles, and other Kind of Fish, in great Plenty.

On Priestholme Island, as well as in some other Parts of Wales, they have migratory Birds, called Puffins, which are pickled and sold for the Tables of the Great…

…N.B. This is not the same Bird as goes by the Name of Puffin in the Isle of Man.”