OF CONCHOLOGY. 231 



of Land and Fresh-water Shells collected in the Rocky Moun- 

 tains in 1860," by T. Bland and myself, Ann. Lye. Nat. Hist. 

 N. Y. vii, 1861). I have already noticed the range of Vancouver- 

 e?isis and Townsendiana in this region. 



On the eastern slope of the " Coeur d'Alene " Mountains (also 

 called Bitter-root), near lat. 47°, I found HJ polygyrella, Bid., 

 a very peculiar shell, like a PoJygyra in form, but with two sets 

 of internal teeth like JTelieodiscus, Morse. Unlike the former, 

 it inhabits moss and decaying wood in the dampest parts of the 

 spruce forest only, and seemed not uncommon for a short dis- 

 tance, though in the haste of travelling I could obtain but few. 



I found Hyalina arborea and Patula striatella, Say, (teste 

 Bland) in the damp bottom lands along the lower valley of Hell 

 Gate River, at an elevation of about 4500 ft. The latter needs 

 comparison with P. Cronkhitei, Newc. 



Anguispira Cooperi, W. G. B., I found on the east slope of 

 Mullan's Pass, lat. 46° 30', at about 5500 feet elevation, burrow- 

 ing around roots under ground in the dry season of August, and 

 semi-torpid. It ranges to the most eastern spurs of the Rocky 

 Mountains, (Black Hills), where Dr. Hayden discovered it, and 

 south nearly to the Mexican Boundary, lat. 32°, perhaps much 

 farther both north and south. 



Bland mentions as Any. solitaria, Say, the similar specimens 

 I found on both slopes of the Coeur d'Alene Mountains above 

 2500 ft. He remarks on their close affinity to the preceding, 

 and Mr. Binney has referred specimens of that species to this. 

 Is it not probable that all those of the Rocky Mountains are 

 Cooperi and the solitaria confined to the north-western States ? 

 Otherwise it is the only large Helicoid known to have such a 

 wide range, though it is not impossible that, like many other 

 animals and plants, it may extend across the continent through 

 British America, passing north of the great plains which sepa- 

 rate most species more completely than the mountains do. The 

 minute species, which are doubtless identical on both sides, will 

 no doubt all be discovered in the wooded region which passes 

 round the plains in lat. 55°. 



In the valley of the Bitter-root River, at an elevation of about 

 4000 ft. above the sea, I found Aug. strigosa, Gld., Eestivating 

 under logs of pine, on a steep slope of shale containing lime in 

 veins. It has about the same range as A. Cooperi, and bears 

 the same relation to that species as we have seen between H. 

 Hillebrandi and H. Mormonum, etc., being in form like H. 

 lapicida. The locality, as I now recollect, was drier and warmer 

 than was inhabited by A. solitaria^ [Cooperi?) west of the 

 mountains. It was discovered by the Exploring Expedition in 



