Two drawings, each of which consists of four octants of a terrestrial globe.

The two drawings are numbered (192 and 193) in the same hand and manner as the Leonardo drawings, and must therefore have come from the Melzi-Leoni album of 550 drawings by Leonardo along with several dozen drawings by Leonardo's associates and followers. But neither the manner of drawing nor the script is Leonardo's; the drawings may possibly be by his pupil and heir Francesco Melzi, but this is far from certain. 

When the drawings were thought to be by Leonardo, they were claimed to be the earliest extant maps on which the name 'America' appeared, and they thus had a certain celebrity in the later nineteenth century (eg. R.H.Mayor, A Mappemonde by Leonardo da Vinci, London 1865; M. Fiorini, 'Il mappamondo di Leonardo da Vinci ed altri consimili mappe' in Rivista Geografica Italiana, I, 1894)