My dear Sir

I must send one line to thank you for the truly kind way you take the accident to your specimen.— I have now mended it; there were 13 fragments, but they fit so well that with the head 18 inches or two feet off, the injury cannot be perceived, & the specimen is as good as ever for Scientific purposes.— I am very grateful for your offer, of a duplicate; but I must tell you that as soon as my monograph is completed, I shall give all my specimens to Brit. Mus.¹ Possibly the fossil species may be published by Palæntog. Soc.—²

Your specimens³ consist of (1^st) the Scalpellum fossula (as I intend to call it, if I find that it has been nowhere described) its affinities I have correctly given you.—⁴ Your specimens contain all the valves except one or two: there is a large single unsymmetrically curved;⁵ this is, I believe, a right-hand anterior latera of lower whorl, & correspond to the valve missing in your specimens, but if so the species must have attained a great size. The only other specimen, I have seen, of S. fossula is a right hand broken scutum in M^r J. Sowerby’s collection from Norwich.

Secondly you have a Carina of the Scalpellum (Pollicipes) Sulcatum of Sowerby.⁶

Thirdly there is a right-hand scutum of a Scalpellum (the one broken & repaired), probably the S. (Pollicipes) maximum of J. Sowerby.—

Fourthly you have a pair of Terga of a Pollicipes, I believe new spec.—

I will attend to all your wishes about the specimens: you need not doubt my referring for my own sake (independently of gratitude) to your Collection, as place of deposit of specimens described. How I wish I c^d see a few more specimens even with two valves together: there is always a risk in describing separate valves of making several nominal species out of one. If you have any oddly shaped, curled valves they w^d be very interesting to me; indeed the more I see the more likely I am to come to correct conclusions—

I can generally now tell the position of a separate Valve, even when the other valves are quite unknown: Judging from the keel valve alone, I think that I have now before me five species of cirripedia from the Chalk. & at least as many more from the Gualt.—

But I am troubling you with details. If I had plenty of specimens I might perhaps make out as many species from the other valves as from the Carina or Keel valve.—

Pray believe me | Yours sincerely obliged | C. Darwin

I forgot to say, that in examining the Boxes sent, I see one has been crushed in the corner & that injury not produced by any jar, & therefore I hope that your specimens will go back quite safe in wooden Box

P.S.⁷ I have opened my letter to say that I have been at work on your specimens, & know from analogy that the single keel-valve specimen of S. sulcatum; has a third lower side in the upper half entirely hidden in the chalk: your specimen is exteriorly more perfect than any I have seen, yet I cannot have it drawn without I c^d exhibit this lower side in upper half:= I am sure I c^d clear chalk from it with safety on one side, as I have done with M^r Sowerby’s specimens. At present the chief characteristic of your valve is hidden.— I enclose envelope directed to save your time: will [you] write word, "yes" or "no" on slip of paper & no more & I will act accordingly.—

I am sorry to say that I have this morning heard from my Brother in London that his house is full & he cannot receive me next week  from this cause & from my wifes confinement I fear I must put off going to London for a week more. I pledge my honour nothing but good reason shall delay me having your specimens drawn & returned.

I really apologise for length of this note.