In the end I decided against Wide Latin: partly because it should come under L, not W; and partly because there's not very much you could really use it for, is there? (Apart, maybe, for 'Wanted' posters for Cosa Nostra.) So, let's have a little elegance instead.
This is Walbaum, designed sometime around 1800 by Justus Erich Walbaum. Walbaum came to typography via the unusual route of confectionery. He taught himself engraving while making his own pudding moulds while working in a pastry shop. At night, he started engraving music types. Eventually he set up his own foundry in a town called Goslar.
In 1802, just before his town was to be incorporated into Prussia, he left for Weimar. Here he established another very successful foundry. His classical types were very popular for a while until fashions changed. His name then disappeared until the 1920s, when the typeface was revived as Monotype Walbaum.
And now, Warnock - which is a little more modern and comes in more weights and variations than you can shake a stick at. It was designed in 2000 by Robert Slimbach (who's cropped up in this series twice before, here and here).
Warnock Pro is a new Adobe Originals type composition family named after John Warnock, the co-founder of Adobe Systems, whose visionary spirit (according to Adobe) has led to major advances in desktop publishing and graphic arts software. A full-featured, state-of-the-art OpenType family - with Latin, Cyrillic, and Greek character sets in a variety of weights and optical size ranges - Warnock Pro is a classic yet contemporary composition family that performs a wide variety of typographic tasks with elegance.
So, just X, Y and Z to go (but they're going to be the toughest six to find, methinks).