Thanks for help on presentation copies of Living Cirripedia, vol. 2.
Suggests he examine cementing apparatus of Balanus.
Down Farnborough Kent
My dear Sir
I thank you much for your two notes & am quite sorry that you
I write now chiefly to say that if time & inclination leads you to look at any
Balanus, do pray look at cementing apparatus, I am sure you
If you do anything more, do look at my acoustic vesicle, eyes & nervous system in the large Bal. perforatus so common at Tenby. I have only casually looked at these parts in these species.—
My dear Sir | Pray believe me | Yours sincerely | C. Darwin
Pray give to whomever you like, the second copy of my Book which you have.—
If you stumble on Scalpellum vulgare do look at the Comp. Males.—
- f1 1592.f1Franz von Leydig, Rudolf Albert von Koelliker, and Carl Vogt. See letters to T. H. Huxley, 2 September  and 8 September .
- f2 1592.f2Huxley examined and dissected cirripede specimens during his stays at Tenby in 1854 and 1855 (see letter to T. H. Huxley, 29 [September 1855]). In 1857, he published a lecture on the Cirripedia (T. H. Huxley 1857), in which he tentatively endorsed CD's views on the connection between the cement glands and the ovaria (p. 239):
Mr. Darwin conceives that the cement apparatus is a peculiarly modified part of the ovary, and he considers that the ova originate in the “true ovaria,” and pass down their ducts into the ramified cœca of the peduncle. Now, the author of the “Monograph” appears to me to prove that … the cement gland and its duct are continuous with the ramified peduncular tubes, and … are modifications of different parts of a continuous organ. Nor have I any objections to urge against this doctrine; my own dissections of Lepas, while they have not enabled me absolutely to trace these parts with one another, rather favouring the conclusion that they are thus connected.He did not, however, believe that the gut-formed glands were the true ovaria, as CD maintained, but held that they were accessory glands and the peduncular tubules were the ovaria. See also Correspondence vol. 4, Appendix II.
- f3 1592.f3Living Cirripedia (1854): 95–7. In T. H. Huxley 1857, p. 239, Huxley stated: ‘While bearing testimony to the faithfulness with which Mr. Darwin has described the general structure of these organs (at least in Conchoderma virgata, in which I have had the opportunity of carefully examining them), I must confess I do not feel quite satisfied as to their function.’
- f4 1592.f4Huxley had recently become a member of the Ray Society.