The Origin of Californian Land Shells

Cover The Origin of Californian Land Shells
The Origin of Californian Land Shells
J G James Graham Cooper
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The great similarity of our banded groups to those of Europe has always been an argument for sui^posing them to have had a common origin. The same similarity is found in many others of our animals as well as plants, and is plainly connected with the well-known similaritj' of climates in the two countries. But as the known laws of nature do not jjermit us to consider climate as the cause of specific resemblances, we mu>t look for some other way of accounting for them in this case.
The fact that
...very similar species exist in Japan and the Amoor Valley, Siberia, contradicts, indeed, the theory of climatic causes, since we know that the climate of those regions is very similar to that of our Atlantic States where no similar species exist. At the same time, their existence there sug- gests the probable central point from which all originated.
Going back in geological history to the sup^josed beginning of all living species, few; if any, of the terrestrial, can be traced farther back than the Eocene Tertiary, and most of them mnoh less far.


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