On Lyell and his collecting, see A. C. de la Mare's catalogue of the Lyell manuscripts at the Bodleian Library, Oxford.
Lyell's aquisition note consists of the pencilled initials of the dealer (D&O=Davis & Orioli, Q=Quaritch, etc.), the date, and his purchase price in code.
His oval leather bookplate or his rectangular paper one is sometimes, but not always, present