The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. n.d. Abstract of Haldeman, Enumeration of recent freshwater Mollusca, etc. CUL-DAR16.300. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2023. RN2

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR16 contains calculations and tables for Darwin's 'big book' Natural Selection F1583.

The brown crayon number '5' indicates that this document was filed by Darwin in his portfolio Origin chap. 5 laws of variation.

[300]

p. 474.— quotes Westwood. (Introduct to Entomol:?)

Boston Journ. Nat. Hist Vol. 4.

(3) 5

In very extensive genera, the distinctions of species are so minute, that it requires the most practised eye to separate them"; & indeed there are some groups the species of which are so intricately blended together, that no two entomologists are agreed as to their distinctness."

(Q)

Haldeman, Samuel Stehman. 1844. Enumeration of recent freshwater Mollusca which are common to North America and Europe; with observations on species and their distribution. Boston Journal of Natural History 4: 468-484.

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)