[IanT]

Good point you make. It is confusing. Maybe, Hartung was using the widespread scientific convention of using the latest classification accepted by peers? So, after Lacaille published his classification it was updated for the southern sky by Gould in his 'Uranometria Argentina' in 1879 (with it's Gould designations for southern stars) and this update was subsequently accepted by Hartung as being the latest and most authoritative version. This might mean that Ridpath either doesn't accept the Gould scheme or he doesn't know about it or he wants to emphasise the original and probably more historically significant classification by Lacaille? I'm sure someone else will know the real story.
Ian