From S. P. Woodward [15 July 1856]1
Lusitanian Shells of wide range beyond the Province.2
–diag
Helix pulchella, Europe generally; Madeira; Caucasus; Tibet; Cape (introduced); Mass. Missouri — Costata, Brit. Sweden, Russia, Caucasus; Iskardo, Tibet 7200 feet. — fulva. Brit. Sweden. US. Georgia (Say) Mass. (Gould) Russ. Caucasus — ruderata, Brit. (fossil) Sweden–Finland, Russia, Stanowoj Mtns, E. Siberia. =? striatella, Anth. US. Vermont, Ohio. Helicella pura, Alder. Brit. Germany, Switz. Russia. E. Siberia; US. Mass. (Gould) — cellaria, Europe; (Cape; N. Zealand;) U. States. Sweden — nitida, Müll. Brit. Iskardo, Tibet. Finmark, Sweden. Mass. US. (arborea, Say) Zua lubrica, Brit. Sweden. Madeira; Iskardo. N. West Territory. Mass. US. Oregon. Succinea amphibia (varieties of) Brit. Sweden Kashmir. U. States. Vitrina pellucida. Brit. Sweden. Greenland (V. “Angelicæ”) U.S. N. England. (V. “Americana”) Limnæa stagnalis, Brit. Sweden— Bercsov, N. Lat. 63o Irkutsk. Kashmir; speciosus, Rossm. + fragilis, Mont. = L. jugularis. Port Vancover, Oregon—Canada. — palustris, Brit. Bernaul, Irkutsk—52o = ? elodes, Say. Mass. — truncatula, Brit. Sweden Bercsov. 63o Tomsk. Iskardo; Candahar; Madeira— = ? desidiosa, Missi.— Atlantic, 35o–45o Lat. — peregra Brit. + Tibet. Siberia 63o Sweden — auricularia Physa hypnorum, Brit. Siberia 70o U. States (Ohio) Cyclas calyculata (= C. partumeia, Say) Sweden. Brit.— Kamtschatka Europe— US. —rhomboidea, Say. U.S.— Lake Champlain. Paddington Canal! An. N. H. June 1856— Valvata piscinalis, Brit. Sweden + Kashmir. Unio margaritiferus, Brit. Sweden, U. States. Labrador. Oregonramme
It must be observed that Latitude is not of so much consequence as the antiquity of the land, or its elevation.
The mountain ranges of Scandinavia, & Central Asia, & the northern part of the Alleghanies, equally belong to the “Arctic Province”—& formed centres from which the species which escaped the Glacial subsidence again diffused themselves—or indeed were driven by the descent of the snow-line. The plain of Kashmir is 5,300 feet above the sea— Iskardo Tibet, 7,200 feet—& the Brit. Limnæa peregra is said to have been found at 18000 feet in Tibet.— I have not yet asked Dr Hooker about it.
The high antiquity of these wide-spread shells is proved in the case of Helix ruderata & pulchella, Zua lubrica & Helicella nitida by their occurrence in the older Pliocene, along with Elephas merid. Rhinoceros leptorhinus & Mastodon—animals which became extinct & were succeeded by another set, in their turn to disappear whilst these land-shells continued to exist!3
CD annotations
Footnotes
Bibliography
Natural selection: Charles Darwin’s Natural selection: being the second part of his big species book written from 1856 to 1858. Edited by R. C. Stauffer. Cambridge: Cambridge University Press. 1975.
Summary
Lists Lusitanian shells with wide ranges beyond that geographical province.
Antiquity and elevation of land mass is more important than latitude for the distribution of shells.
Letter details
- Letter no.
- DCP-LETT-1928
- From
- Samuel Pickworth Woodward
- To
- Charles Robert Darwin
- Sent from
- unstated
- Source of text
- DAR 205.3: 305
- Physical description
- inc †
Please cite as
Darwin Correspondence Project, “Letter no. 1928,” accessed on 18 April 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-1928.xml
Also published in The Correspondence of Charles Darwin, vol. 6