I2O LAND AND FRESH WATER MOLLUSKS 



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



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

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



rji Range. Eastern North America from Georgia to 



Iowa and Hudson Bay. 



FIG. 92. Po- Moose Factol y N< L at. 51, on Hudson Bay. 

 mattopsis lapi- _,, . ., '.- 



, . Ihere is some doubt as to whether Says lustrica 



aarta bay. f , 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 VALVATIDJB. 

 Genus Valvata Muller. 



Valvata MULLER, Hist. Verm., n, 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. LAMARCK, Hist. 

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



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



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

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



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



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

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



Valvata cristata Muller. 



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

 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. 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., ist sp. 



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



Russia, named for Prof. Jelski, of Kieff. 



> Jelskia WESTERLUND, Fauna Pal. Reg., vi, p. 143, 1886; not ofTacza- 



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

 without spiral keels. Type V. cristata Muller. 



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



