16 A'ALVATID^, 



4. Valvata stoliczkana. 



Valvata stoliczkana, O. NeciU, Moll. Miss, Ydrkand, lS7S,Jlgs. 34 — 3iy, 

 Ydrkand. 



30 Yai-liaud (type); coll. Dr. F. Stoliczka. 



Exceedingly close to V. onacrostoma, Stein, possibly only a 

 variety ; distinguished by being a little more depressed, with 

 more open umbilicus, &c. 



5. Valvata alpestris. 



Valvata alpestris, Blauner, 3Is., Kiister, Conch. — Cab. II, 1852, pi. 14, Jigs. 

 7 — 8, Grindelwald. 



1 Aix-les-Bains ; coll. G. Nevill, Esq. 



Perliaps better classed as a var. of V. piscinalis ! In any 

 case, a well marked form ! 



12 Tirol ; coll. P. Bouvier, Esq. and P. Joly, Esq. 



6. Valvata eximia. 



Valvata eximia, Servahi, Moll. Espagne, 1880, Badajoz : alt. 4, diam. 5 mil. 

 20 Burgos ; coll. G. Nevill, Esq. 



7. Valvata virens, 



Valvata virens, Tryon, Froe. Acad. Philad. 1867, pi. I, Jig. 7, California. 

 18 Clear Lake, California ; ex c. Prof. W. Newcomb. 



8. Valvata tricarinata. 



Cyclostonia tricarinatum, Lesiieur, Ms., Say, Journ. Acad. Philad. 1, 1817, 

 Ri\ Delaware; sect. Tropidina. 



30 New-York ; ex c. Revd. E. R. Beadle and Prof. W. Newcomb. 



var. unicarinata. 



Valvata unicarlnatum, De Kay, New-York Moll. 1840. 

 12 New-York ; coll. Prof. W. Newcomb, 



9. Valvata sincera. 



Valvata sincera. Say, Keating's, Narr. Long's Exp. II, App. 1824, North- 

 West Territory ; Jide Newc. = V. humerosa, Tryon. 



6 California ; ex c. Prof. W. Newcomb. 



