No. (18) consists of ten maps, including a graduated Ptolemaic mappemonde, and a circular world-map, somewhat resembling Vesconte, probably copied and re-edited from a very early portolan, with a certain theoretical extension.[264] The original of this is supposed by some to have been a late thirteenth-century work; its West African names and detailed charting end at Cape Non--an incredibly backward point for the time of revision, viz., A.D. 1436. A ship is, however, depicted in full sail far down the west coast[265] of a Continent whose general shape is conceived as "Strabonian" or "Macrobian," with its length from east to west, and consequently possessing a long southern shore. The Negro Nile flows straight from Babylon or Cairo, into the Atlantic, near (but north of) the picture labelled Rex de Maroco. The western Mediterranean, Adriatic and Ægaean, as well as the Black Sea and Caspian, are poorly drawn, and suggest an early and crude type of portolan. [Footnote 264: See _Azurara_, Hakluyt Soc. ed., vol. i, Map No. 4 at end of volume.] [Footnote 265: Is this an addition of the Editor to bring it up to date? The reviser must, however, have added very largely to this map; _e_. _g_., both Russia and Turkey (?), as here depicted, do not correspond at all to the _late_ thirteenth century, but agree better with the fifteenth; though for 1436 Russia seems unduly magnified. _Imperium Tartarorum_ appears immediately north of the Sea of Azov. The Moslem prince near the Bosphorus is probably meant for the Ottoman Sultan.] No. (19), signed "Andrea Biancho venician comito di galia mi fexe a LONDRA MCCCCXXXXVIII," was probably executed with a special view of illustrating the discoveries of the Portuguese along West Africa, and contains the enigmatical inscription in the S.W., which some have construed into a Portuguese discovery of South America about this time.[266] Besides the interest of this controversy, and of the fact that it was one of the first scientific maps drawn in England, this chart gives us in West Africa some of the earliest indications of the new Portuguese discoveries. Thus, beyond Cape Bojador, or Buyedor, we have on the mainland shore-line twenty-seven names reaching to Cape Roxo or Rosso, and including Rio d'Oro, Porto do Cavalleiro ("Pro Chavalero"), the Port of Galé ("Pedra de Gala"), Cape Branco, Cape St. Anne, and Cape Verde. [Footnote 266: See pp. ciii-cvi.] This example has often been spoken of as the earliest map-register of Prince Henry's discoveries, but herein it must yield to No. (20), the Valsecca (Vallesecha) of 1434-9, which mentions the discoveries of Diego de Sevill in the Azores in 1427,[267] and maps the north-west coast of Africa scientifically to Cape Bojador (Bujeteder) and "theoretically" for some way beyond. [Footnote 267: See p. cxiv of this Introduction.]