VALVATID^K. 15 



2. Family VALVATIDiE, Gray, 



Genus VALVATA, Muller. 



Hist. Venn. II, p. 198, 1774, type V. cristata, Miill. ; sect. Tropich'na, 

 H. and A, Ad., type V. tricar inata, Lesweur ; sect. Cincinna, Huhner 

 {fide Morch), type Nerita piseinalis, Miill. [ = Valvatinella, Betta, 

 1870']; sect. Jelskia, Boury., Syst. JEurop. Sfc.,1877, type Valvata jeisJcii, 

 Crosse, J. de C. 1863, Bv. Dnieper. 



1. Valvata cristata. 



Valvata cristata, Muller, Hist. Verm. 1774, Denmark. 



4 Middlesex; coll. G. Nevill, Esq. 



6 Bayonne; coll. G. Nevill, Esq. 



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



2. Valvata piseinalis. 



Nerita piseinalis, Muller, Hist. Verm. 1774, Denmark ; = V. tolosana, 

 Saint Simon, Ann. Malac, 1870, Toulouse, alt. 4, diam. 5 m. ; sinistral 

 var. Jef., Ann. and May. 1878, Sunhury and vars. suhcylindrica from 

 Grassmere and acuminata from Bristol and Dublin ; var, = V. depressa, 

 C. Pfr. ; sect. Cincinna . 



3 England; coll. G. Nevill, Esq. 

 10 Bayonne ; coll. G. Nevill, Esq. 



6 Pyrmont, Germany; ex c. Dr. F. Stoliczka. 

 80 Pangong Lake, Ladak ; coll. Dr. F. Stoliczka. 



4 Kashmir ; coll. Dr. F. Stoliczka. 



7 Canal du Fresquel, Aude ; coll. P. Fagot, Esq. (as " V. tolosana "). 



I find it impossible to separate these typical specimens of 

 V. tolosana, from ordinary V. piseinalis, even as a variety. 



1 Lake Alakul, Siberia; ex c. Dr. H, Dolirn. 



3, Valvata eontorta. 



Nerita eontorta, Miiller, Hist. Verm. 1774, Denmark. 



11 Laacher See, Rhineland; coll. G. Nevill, Esq. 

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



A smaller form than the preceding. 



