Letters are summarised by Lyell as: 1) Dr Duncan on Bolderberg Flabellum [relating to Bolderberg formation in Northern Belgium] 2) Tropical corals, how far corals can indicate climate 3) Corals in Norway sea 4) 60 new Liassic [Early Jurassic] corals, showing imperfection of record 5) Lonsdale notes and Keeling island [Cocos, Australia] specimens 6) Scleractinia of antigua corals and explanation of Duncan's theory 7) reference to his paper on corals 8) Corals dredged up by the 'Porcupine' [referring to HMS Porcupine expedition of Porcupine Bank, West Ireland] and Faroe Islands.