Comments on concretionary bodies found by JD. Encourages him to continue geological study.

Thanks for her sympathy on the death of Annie Darwin, and sends news of Emma Darwin and the baby Horace.

Obliged for letter about cirripedes attached to turtles’ backs. Genus is Chelonobia, Leach. Cirripedes do not penetrate skin, but surrounding tissue grows up around them.

Asks RB to send S. American Balanus. Already has specimens from Irish coast.

Thanks for cirripede specimens. Describes progress [on Living Cirripedia].

Collection of recent cirripedes received. The fossil cirripedes have been returned.

Mentions his account. Reduction in rent paid by Mr Hardy.

Asks whether he can borrow from Joshua Alder an article [Sven Ludvig Lovén, "Ny art af Cirripedia Alepas squalicola", Ofers. Kongl. Vetensk. Acad. Förh. 1 (1844): 192–4] in order to have the plate copied. Asks to borrow additional specimen of Ibla.

Thanks for cast and account of cirripede [Chelonobia caretta] burrowing in turtle shell. Believes base of cirripede absorbed by bone below.

Asks for reference to article by Kölliker, ["Some observations on the structure of two new species of Hectocotyle", Trans. Linn. Soc. Lond. 22 (1851): 9–22]. Asks for information.

Suggests that JD consult with Edward Forbes about dredging.

Delighted he will look for fossil bones.

Asks him to look for Australian cirripedes.

Thanks AH for assistance and Joshua Alder for his kindness. Ibla specimens offered would not aid him.

Asks to re-examine specimen of Scalpellum. Discusses publication [of Fossil Cirripedia] by Palaeontographical Society.

Discusses the Jura blocks.

Read a letter from CD. Resolved that labels be printed for the backs of each number of monograph printed and forthcoming.

Asks to borrow woodcut from Palaeontographical Society for use in Living Cirripedia, vol. 1.

Thanks for report [on echinoderms, Ann. & Mag. Nat. Hist. 2d ser. 8 (1851): 1–19]. Wanted to learn about metamorphosis of the class. Agrees with THH’s distinction between individuals and zooids, but thinks zooids will never cease to be called individuals.

Finds he needs four woodcuts for the introduction [to vol. 1 of Living Cirripedia], which calls for quick action. Will send entire MS by the end of the month.

Will bring MS [of vol. 1 of Living Cirripedia] on the last day of July, and proofs of the eight plates now engraved will be sent soon. CD has failed to get materials for the one coloured plate he wanted, so none will be in colour. There will be ten altogether. He will ask later whether he must pay for the extra one. G. B. Sowerby Jr comes next day to complete drawings for two not yet engraved.

Asks to borrow an old pair of GN’s dissecting scissors so that Weiss & Co. can use it as a model.

Health has been poor.

Has finished MS on pedunculated cirripedes for Ray Society [Living Cirripedia, vol. 1 (1851)].

Asks EL whether he should use both Latin and English descriptions of specific characters [in vol. 1 of Living Cirripedia].