![Darwin, C. R. 1854. A monograph on the sub-class Cirripedia, with figures of all the species. The Balanidæ, (or sessile cirripedes); the Verrucidæ, etc. etc. etc. London: The Ray Society. Volume 2 Darwin, C. R. 1854. A monograph on the sub-class Cirripedia, with figures of all the species. The Balanidæ, (or sessile cirripedes); the Verrucidæ, etc. etc. etc. London: The Ray Society. Volume 2](http://darwin-online.org.uk/converted/published/1854_Balanidae_F339.2/1854_Balanidae_F339.2_figs1-3.jpg)
Darwin, C. R. 1854. A monograph on the sub-class Cirripedia, with figures of all the species. The Balanidæ, (or sessile cirripedes); the Verrucidæ, etc. etc. etc. London: The Ray Society. Volume 2
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Fil:The arteries and lungs (fig. 2), after Haller; the breast (f Wellcome V0007831EL.jpg – Wikipedia
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