Detholiad o Morris, L., 1748. Plans of Harbours, Bars, Bays and Roads in St. George's Channel. Mae'r detholiad (tudalen 47) yn disgrifio presenoldeb y morgi glas yn nyfroedd Aberystwyth.

Mae'r detholiad yn darllen fel a ganlyn: “THESE Fish are common in these Seas, and grown to about five Yards long: But it seems they are not so voracious as the White Shark, for I have heard of no Harm these have done, except destroying of Nets. The Liver of this Fish fills almost the Cavity of the Body, and is so tender, that the Heat of the Sun will turn it into Oil.”