This green leather notebook contains Lyell's notes while traveling in Copenhagen, Denmark. Lyell's address is written on the inside cover, "Charles Lyell, 16 Hart St, Bloomsbury Sq, London". Notes are hasty lists and reflections in pencil and ink, with some blank pages and only small sketches. Notes pertain largely to shells, mollusks, and work done by Dr. Heinrich Heinrichsen Beck, likely from his 1837 'Index of Mollusca'.

The following table of contents is Lyell's own words, copied from Lyell's own "Index", found at the beginning and end of the notebook, transcribed from digital surrogates using the platform Transkribus. When known, Lyell's abbreviations and contractions have been expanded using brackets []. When writing is unclear, and transcription is not possible, this is denoted using [...]. Quotation marks are Lyell's own notation for ditto, as is the abbreviation "d'o". The inclusion of [sic] indicates the misspelling of a word is deliberate and taken from the notebook.

p. 9, Corbula in Caspian + La Olata
p. 9, Nautilus danicus
p. 14, Cardita crassicosta
p. 19,39,51,63,89, Beck, Dr., queries for
p. 21, [Beck, Dr.] on Mollusca
p. 46,58, [Beck, Dr.] on cause of diff[erence] in shape of sehlls of Argonaut
p. 48, [Beck, Dr.] on Geography of shells
p. 49, [Beck, Dr.] on Lea + Courad's works
p. 49, [Beck, Dr.] on Buccinum under-turn
p. 59, [Beck, Dr.] an increase of species
p. 64, [Beck, Dr.] time which has cultivated Nat[ural] History
p. 84, [Beck, Dr.] on Carnivor[ous] Trachelipods contemp[orary] with large Cephalopda
p. 86, [Beck, Dr.] on Bruciere + Huras
p. 109, [Beck, Dr.] Insects for _ how to send them
p. 41, [Beck, Dr.] Books etc wanted by
Index continued
p. 29, Dentalia, how to distinguish species of,
p. 35,47,93,114, Results of examination of Paris identicals
p. 52, Recent + fossil Genera
p. 60, Lym-fiord freshw[ater] form[ation] in middle of salt-water
p. 58,60, Danish Insects
p. 83, Murex radix, price of