VALVATiU.'E. 15 



2. Family VALVATID^, Gray. 



Gemis VALVATA, MUller. 



Hist. Verm. II, p. 198, 1774, tt/pe V. cristata, Mull. ; sect. Tropidina, 

 H. and A. Ad., type V. tricarinata, Lesueur ; sect. Cincinna, Hubner 

 {fide March), type Nerita piscinalis. Mull. [ = Valvatinella, Betta, 

 1870']; sect. Jelshia, ~Bourg.,Syst. Europ. <^c,,1877, type Valvatajelskii, 

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



1. Valvata cristata. 



Valvata cristata, Miiller, 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 piscinalis. 



Nerita piscinalis, Miiller, Hist. Verm. 1774, Denmark ; =■ V. tolosana, 

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

 var. Jef., Ann. and Mag. 1878, Sunlury and vars. suhcylindrica from 

 Orassmere 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. 

 30 Paiigong 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 

 F. tolosana, from ordinary V. piscinalis, even as a variety, 



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



3. Valvata contorta. 



Nerita contorta, 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. 



