120 LAND AND FRESH WATER MOLLUSKS 



Paludina lustrica Say, Journ. Acad. Nat. Sci. Phila., II, p. 175, 1821. 



Pomatiopsis lustrica Binney, Land and Fw. Sh. N. Am., 

 a ill, p. 94, fig. 189, 1865, Cayuga Lake, N. Y. 



rj, Range. — Eastern North America from Georgia to 



^^ Iowa and Hudson Bay. 



Fig. 92. Po- Moose Factory, N. Lat. 51 °, on Hudson Bay. 



, . „ * There is some doubt as to whether Say's lustrica 



darta Say. # . J 



is the young of his lapidaria or not. I have fol- 

 lowed the general usage in uniting them. If they should prove dis- 

 tinct it is, according to Mr. Binney, the P. lustrica which occurs in 

 the Northwest and on the watershed south of Hudson Bay. 



Family VALVATHXE. 

 Genus Valvata Muller. 



Valvata Muller, Hist. Verm., 11, p. 198, 1774 ; sole ex. V. cristata Muller, 

 Europe; Zool. Dan. Prodr., p. 239, 1776. — Draparnaud, Tableau, 

 pp. 30, 42, 1801 ; Hist. Moll. Terr, et Fluv. France, pp. 26, 28, 41, 

 1805. — Roissy, Hist. Nat. Moll., v, p. 379, 1805. — Lamakck, Hist. 

 An. s. Vert., vi, 2, p. 171, 1822. 



Valvata + Valvearus Dumeril, Zool. Anal., p. 164, 1806. 



(?) Cincinna Hubner, Zwei Briefe, 1, 18 10, fide Menke, in Herrmannsen, 

 Ind. Gen. Mai. Suppl., p. 50, 1852. 



Gyrorbis Fitzinger, Verz, p. 117, 1833 ; type ft cristata Muller. 



> Valvata Fitzinger, Verz, p. 117, 1833; type V. piscinalis (Muller). 

 Planella Schluter, Syst. Verz. Conchyliensammlung, p. 13, 1838 ; sole ex. 



Valvata cristata Muller. 

 Volvata Berge, Conch. Buch, pp. 17, 20, 26, 1847 ; err. typ.t 

 Tropidina H. and A. Adams, Gen. Rec. Moll., 1, pp. 343, 344, 1854, type 



V. tricarinata Lesueur, N. Am. 

 Concinna ' Hubner, ' fide H. and A. Adams, op. cit., p. 343, 1854. 



> Valvata Schluter, op. cit., p. 13, 1854 ; V. piscinalis Fer. 



> Cincinna Morch, Vidensk. Meddel. for 1863, p. 321, 1864. — Wester - 



lund, Fauna Pal. Reg., vi, pp. 131, 132, 1886. (Type V. piscinalis 

 Muller ?) 



> Tropidina Morch (not Adams), Vidensk. Meddel. Kjob., for 1863, p. 320, 



1864, V. minuta Drap., 1st sp. 



> Ielskia Bourguignat, Descr. Nouv. Gen. Alg., 1877, V. jelskii Crosse, 1863, 



Russia, named for Prof. Jelski, of Kieff. 

 ^>Jelskia Westerlund, Fauna Pal. Reg., vi, p. 143, 1886; not of Tacza- 

 novich, Arachnida, 187 1. 



> Gyrorbis Westerlund, Fauna Pal. Reg., vi, p. 142, 1886. 



This genus has been subdivided, according to the form of the shell, 

 into the following sections, which appear, however, to have very little 

 value. 



Valvata s. s. (Gyrorbis Fitz.) Shell planorboid or depressed, 

 without spiral keels. Type V. cristata Muller. 



Cincinna Morch ( Valvata Fitz.). Shell turbinate, with a mod- 



