I2O LAND AND FRESH WATER MOLLUSKS 



Paludina lustrica SAY, Journ. Acad. Nat. Sci. Phila., u, p. 175, 1821. 



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

 in, p. 94, fig. 189, 1865, Cayuga Lake, N. Y. 



Range. Eastern North America from Georgia to 

 Iowa and Hudson Bay. 

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



//> , pi 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 VALVATID^E. 

 Genus Valvata Miiller. 



Valvata MULLER, Hist. Verm., n, p. 198, 1774 ; sole ex. V. cristata Miiller, 

 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. 



(?) Cindnna HUBNER, Zwei Briefe, I, 1810, fide Menke, in Herrmannsen, 

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



Gyrorbis FITZINGER, Verz, p. 117, 1833; type ?? cristata Miiller. 



> Valvata FITZINGER, Verz, p. 117, 1833; type V. piscinalis (Miiller). 

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



Valvata cristata Miiller. 



Volvata BERGE, Conch. Buch, pp. 17, 20, 26, 1847 ; err. typ.f 

 Tropidina H. and A. ADAMS, Gen. Rec. Moll., i, pp. 343, 344, 1854, type 



V. tricarinata Lesueur, N. Am. 

 Concinna ' HUBNER, ' fide H. and A. Adams, op. dt., p. 343, 1854. 



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



> Cindnna MORCH, Vidensk. Meddel. for 1863, p. 321, 1864. WESTER- 



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

 Miiller ?) 



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



1864, V. minuta Drap., ist sp. 



> lehkia BOURGUIGNAT, Descr. Nouv. Gen. Alg., 1877, V.jehkii Crosse, 1863, 



Russia, named for Prof. Jelski, of Kieff. 



> Jehkia WESTERLUND, Fauna Pal. Reg., vi, p. 143, 1886; not of Tacza- 



novich, Arachnida, 1871. 



> 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?,.?,, (Gyrorbis Fitz.) Shell planorboid or depressed, 

 without spiral keels. Type V. cristata Miiller. 



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



