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Darwin Correspondence Project

To William Harris1   4 March [1851]

Down. Farnborough Kent

March 4th.

My dear Sir

At last I have finished the last proof of my little monograph, & am enabled to return you your specimens with very many thanks. I hope that they will reach you quite safely. I have named two new species from your collection;2 I have no doubt it contains several other new forms, but all your specimens are so young that I dare not attach names to them.3 I have enclosed a catalogue of such specimens, as I could venture even approximately to name.— One of the species described from your specimens viz. S. tuberculatum, is an unusually well-defined & interesting species.— You have but few specimens of it; otherwise I shd. have begged for one or two to present to the British Mus. with the rest of my collection.—

Once again accept my best thanks & believe me, dear Sir | Yours very faithfully | C. Darwin

The second species, described from your collection, P. semilatus is a unique specimen.—


Harris had lent CD several fossil cirripedes (see Correspondence vol. 4, letter to William Harris, 6 August [1850]).
Scalpellum tuberculatum and Pollicipes semilatus (Fossil Cirripedia (1851): 43, 72).
Even the valves from the two species identified and named by CD were minute: he recorded that in Harris’s specimens of S. tuberculatum the carina measured only 0.2 inches and the terga less than 0.15 inches (Fossil Cirripedia (1851): 43).


Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 27 vols to date. Cambridge: Cambridge University Press. 1985–.

Fossil Cirripedia (1851): A monograph on the fossil Lepadidæ, or, pedunculated cirripedes of Great Britain. By Charles Darwin. London: Palaeontographical Society. 1851.


Has finished the last proof of his monograph [Fossil Lepadidae] and returns WH’s specimens. Has named two new species from the collection.

Letter details

Letter no.
Charles Robert Darwin
William Harris
Sent from
Source of text
The British Library (Add MS 42579: 233–4)
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 1393,” accessed on 27 October 2021,

Also published in The Correspondence of Charles Darwin, vol. 5