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AMERICAN JOURNAL 



second coast species that extends east of the Cascade Mountains, 

 having been found on the mountains of Idaho near lat. 45° (New- 

 comb), and by me in Montana, lat. 48°, at elevations from 2200 

 up to 5600 feet above the sea. It thus extends north about 500 

 miles, and probably farther, also eastward for about 450 miles, 

 but east of the Cascade Range is confined to the mountains. Its 

 high elevation there is evidently connected with the humidity of 

 the climate, which becomes too dry for this or any other species 

 after leaving the base of the wooded ranges, so that the interior 

 plains are destitute of them. 



The interior of the north-western counties of California, as far 

 as known, is destitute of limestone except as fossiliferous rock, 

 and that is scarce. Few Helicoids appear to have been found 

 there, but one of them is peculiar as far as known, — the Macro- 

 eyclis Voyana, Newc, discovered at Canon Creek, Trinity Co., 

 near lat. 41°, and several thousand feet above the sea. The form 

 or species called 31. sportella is also found in Klamath Co., at 

 about 6000 feet elevation (Voy), and a form between it and 

 Vancouverensis at Humboldt Bay (Rowell). 



At the Columbia river, near the junction of the Willamette, 

 lat. 46, we first meet with Odotropis devia, Gould, the only well- 

 marked representative of the large eastern group usually called 

 Mesodon. It extends to Vancouver's Island, about 250 miles, 

 and probably farther north, as the Helicoids of British Columbia 

 are almost unknown north of lat. 49°. 



The other species which occur in the Oregon region are 31. Van- 

 eouverensis, abundant and very large, 31. sportella, rare, H.fidelis, 

 abundant, H. Townsendiana, abundant, II. anachoretaf rare, A. 

 Columbiana, abundant, A. germana, rare. H. arborea is reported 

 by Dr. Newcomb from British Columbia, and probably will be 

 found, together with other Helicellince and Vitrinince, in this region 

 also, which I limit to the country west of the Cascade Mountains 

 (see my article on the distribution of forests and trees, in the 

 Smithsonian Report for 1858). The whole region is thickly 

 wooded, copiously watered, and lime is abundant nearly every- 

 where, so that it seems a perfect paradise for Helicoids, con- 

 sidering its northern situation. The finest of the banded species 

 is indeed peculiar to it, and more might be expected if it had 

 not been very thoroughly searched. 



Montana Helicine Region. — This corresponds in part to 

 what I called the Kootanic Region of forests, but since that name 

 was published the new territory of Montana has been created, 

 including also the eastern slopes of the Rocky Mountains above 

 lat. 46° ; and as I found several species common to both slopes 

 in 1860, 1 adopt the political name for the Helicoids (see "Notice 



