To T. H. Huxley 20 February 
Down Farnborough Kent
My dear Huxley
I send a few specimens of the cementing apparatus of Sessile Cirripedes,1 & shd. be very glad if at some future time you wd have a look at them; merely that I may feel that I have one living witness of this odd structure which I have described.2 I send a single specimen, also, of an ovigerous frænum with its so-called glands;3 as this specimen was in act of moulting it entirely puts out of the question the bodies which you doubt about being foreign organisms.
I saw some time ago that you do not find any anus in the Brachiopod Molluscs;4 I may just mention that this is precisely the case with the Cirripede Alcippe in which rectum & anus are absolutely null.—5
I have this morning just received your Article on Mollusca;6 I am particularly obliged to you for having sent it to me, as I had heard of it & shall be very glad to read it, as indeed everything which you write. But as far as criticism goes, I really do not know enough of the subject to pretend to offer an opinion worth the paper on which it shd be written.
Yours very truly | C. Darwin
This note & specimen &c all goes in a parcel for Dr. Percy.—7
Please look at specimens in following order, with good & varying light & moderately high powers. I shd like to have them back at some future time.— 280. Basal membrane of Coronula; showing cement-glands & ducts simplest structure in any Sessile Cirripede. 219. do of Chelonobia: ducts bifurcating more complicated; cement glands small. 203. do of Elminius: ducts very complicated: main cement trunk tortuous, like a great worm. 285. fragments of basis of Balanus tintinnabulum, after dissolution in acid, showing curious cement glands & bifurcating ducts 179. Piece of ovigerous frænum of Lepas anatiferum, showing glands. N.B. This specimen was in act of moulting, & the old membrane with the old glands & the new membrane with new glands, closely investing the corium, can both be plainly seen. Use th. focal distance & good light.—
- Letter no.
- Darwin, C. R.
- Huxley, T. H.
- Sent from
- Source of text
- Imperial College of Science, Technology and Medicine Archives (Huxley 5: 23, 372, 376)
- Physical description
- 4pp, Amem 2pp
Sends specimens of sessile cirripedes for corroboration of their cementing apparatus.
Absence of anus in Brachiopoda and Alcippe cirripedes.
Please cite as
Darwin Correspondence Project, “Letter no. 1635,” accessed on 11 February 2016, http://www.darwinproject.ac.uk/DCP-LETT-1635