139 



Limnea catascopium, Say. — New England to Lewis [Snake] River, and 

 through British America {Binney) ; Lake Utah {Burton) ; Idaho (?). 



Limnea Binneyi, Tryon. — Hell-Gate Eiver, Montana {Binney). 



Limnea emarginata, Say. — Kew England to Washington Territory 

 {Auct). 



Limnea ? 



Colorado 6 specimens. 



Remark. — " Comes near L. Trasldi, but distinct." — Dr. Jas. Lewis,, 

 n letter. 



Limnea hulimoides, Lea. — Oregon {Nuttall; Sayden). 



Limnea humilis, Say. 



Camp 17 : San Luis Valley 2 specimens. 



Camp 36 : Howardsville, Baker's Park 1 specimen. 



"All over the continent " {Lewis) ; Hell-Gate River, Montana ( Cooper). 



Limnea ferruginea, Haldeman, 



Between the Animas and La Plata 2 specimens. 



Oregon (Nuttall). 



Remarks. — "If not L.femiginea, it may be new." — Dr. Jas. Lewis^ 

 iii letter. 



Class COISTCHIFERA. 



Order DIMYARIA. 

 Family CORBICULAD.E. 



Sphcerimn striatinumi, Lamarck. — Hell-Gate River and Missouri River 

 above the Falls {Cooper) ; Humboldt River, Nevada {Hepburn). 



Sphcerium occidentale, Prime. — Hell-Gate River {Cooper). 



Bphcerium dentatum, Hald. — Oregon {Nuttall). 



Sphcerium patella, Gould. — Walla- Walla, Oregon {(J. S. Expl. Lxped.). 



ISplicerium lenticula, Gld. — Lake Tahoe and Carson River {Cooper). 



Sphwrium tumidum, Baird. — Sumass Prairie, Fraser River {Lord). 



Sphceritim spoTcani, Baird. — Spokane and Kootanie Rivers {Lord-, 

 Hemphill). 



Sphmrium tenue, Prime. — I am confident that I secured this species 

 (one specimen) at the Rio La Plata. It has been recorded, I think, from 

 Montana and another northern locality. 



Pisidium abditum, Haldeman. 



Camp « : Hot Springs 30 specimens. 



Camp D : Animas Valley 1 specimen. 



Saint Mary's Lake, Antelope Park 1 specimen. 



Raft River, near Fort Hall, Idaho {Beid); Truckee River {Carlton). 



Remarks. — These specimens vary greatly in color, but seem to be all 

 referable to this widely-distributed species. Many young, about half- 

 grown. 



