It would puzzle any one, unacquainted with the mistakes and blunders of transcribers, to conjecture how TOISOBIUS should become PTOLEMY’S CONOBIUS, or Conovius, (or Conovium) but when we reflect a little, it may be supposed, that the initial C, might be easily mistaken for T, and the v converted into b, so as to form TOINOBIUS, instead of COINOVIUS. The derivation of the word Cynwy, seems to be, as Mr. Edward Llwyd conjectures, from _Cyn_, chief or principal, and _Gwy_, or _wy_, water; the prefix _cyn_, being augmentative, as cyn-gann, very white; cyn-dynn, very stiff; or signifying first or chief, as cynfyd, the old antediluvian world; cyn-ddydd, daybreak; and Dr. Davies supposes _cyn_ to be synonymous with penn, as _cyntaf_, _penaf_, first or chief. Admitting this, _Cungetorix_ would be _Cyntwrch_, and _Cunobelinus_, _Cynfelyn_, _&c._ The River Conway has been celebrated for ages, for its muscle-pearl fishery. Pliny informs us, that Julius Cæsar dedicated to Venus Genetrix, in her temple at Rome, a Breastplate set with British Pearls; and Suetonius alledges the acquisition of these, as one motive for his invasion of the Island. Mr. Edward Llwyd asserts that the pearls found in this river are as large, and as well coloured, as any in Great Britain or Ireland, and says that he saw several very fine large ones in the possession of Robert Wynne, Esq. of Bodysgallen. Mr. Pennant distinguishes this shell-fish by the name of _Mya Margaritifera_. A vein of Burr, (a species of Mill-stones) was discovered near Conway, about the year 1800, but being inferior in quality to those brought from France, there is no great demand for them.