Your PDF has successfully downloaded.
You may be interested in finding more content on these topics:
You are not currently logged in.
Access JSTOR through your library or other institution:
Scharff's History of the European Fauna
The American Naturalist
Vol. 35, No. 410 (Feb., 1901), pp. 87-116
Stable URL: http://www.jstor.org/stable/2454249
Page Count: 30