VALVAT1RE. 15 



2. Family YALYATID^, Gray. 



Genus VALYATA, Mutter. 



Hist. Verm. II, p. 198, 1774, type V. cristata, Mull. ; sect. Tropidina, 

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

 (fide MorcK), type Nerita piscinalis, Mull. [ = Valvatinella, Betta, 

 1870'] ; sect. JelsJcia, Bourg., Syst. JEurop. Sfc. y 1877, type Valvata jelskii, 

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



1. Valvata cristata. 



Valvata cristata, Mutter, 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, Mutter, Hist. Verm. 1774, Denmark ; = V. tolosana, 

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

 var. Jef., Ann. and Mag. 1878, Sunbury and vars. subcylindrica 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 Pyrniont, Germany ; ex c. Dr. F. Stoliczka. 

 30 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. piscinalis, even as a variety. 



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



3. Valvata contorta. 



Nerita contorta, Mutter, 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. 



