82 LAND AND FRESH WATER MOLLUSKS 



Adiihi H. Adams, P. Z. S., 1861, p. 145 ; P. vniltivolvis Case, not Adula 



H. and A. Adams, 1857. 

 Aiucriis H. Adams, P. Z. S., 1869, p. 275 ; not Anctsus Fauvel, 1863. 



Subgenus Tropidiscus Stein. 



Tropidiscus Stein, Schn. u. Muscheln Berlins, p. 76, 1850 ; P. complanatus 



Stein ( = margmatus Drap. -j- Mnbilkatits Miiller). 

 Trophidiscus H. and A. Adams, Gen. Rec. Moll., 11, p. 263, 1855, in 



synonymy. 

 Aiiisus FiTZiXGER, Verz, p. in, 1833, ex parte, not of Studer, 1820, nor 



Dujardin, 1821. 

 Gyrorbis MoQUiN Tandon, Hist. Moll. Terr, et Fluv. de France, pp. 423, 428. 



1885 (not of Fitzinger, 1833); P. cariiiatiis Miiller; Gray's Turton, 



new ed., p. 237, 1857. 

 Tropodiscus Surbeck, Moll. Faun. Vierwaldstattensis, Rev. Suisse de Zool., 



VI, p. 435, 1899. 

 "y. Tropidiscus Westerlund, Act. Soc. Fauna Fennica, xill, p. 113, 1897, 1st 



sp. P. umbilicatus Miiller. 

 'y. Diplodiscus 'V^-E^TKV.iM'iiT), op. ci/., p. 115, 1897, 1st sp. P. vortex Linne. 



Section Paraspira Dall, nov. 



Spirorbis Swainso.n', Malac, p. 337, 1840; P. rotundatus Poiret ( + /". 



vulgaris Swains.), not Spirorbis Daudin, Vermes, 1800. 

 Gyrorbis MoRCH, Vidensk. Meddel. Kjob., for 1863, p. 313, 1864, not of 



Fitzinger, 1833. 

 Planorbis (sp.) Agassiz, in Charpentier, Fauna Helv., p. 21, 1837. 

 Aiiisus (sp.) Fitzinger, \'erz, p. 1 11, 1833 ; not of Studer, 1820. 



Subgenus Hippeutis Agassiz. 



Hippeulis Agassiz, in Charpentier, Fauna Flelv., p. 22, 1837 ; P. complanatus 

 Drap. {= P. fontanus Lightfoot). — Hartmann, Syst. Uebers. , table, 

 1840 ; Erd. u. Sussw. Gast., pp. 51, 87, 1844. — Gray, inTurton's Man., 

 ed. II, p. 243, 1857. — Morch, Vidensk. Meddel., 1863, p. 316, 1864. 



HippeiUes Mrs. Gray, Figs. Moll. An., iv., p. 119, 1859. 



Section Menetus H. and A. Adams. 



Meneius H. and A. Adams, Gen. Rec. Moll., 11, p. 262, 1855 ; no type 

 selected (not of Chenu, 1869, or Fischer, 1883). — Binney, Land and 

 Fw. Sh. N. Am., 11, p. 125, 1865. 



Menetus Dall, Ann. Lye. N. Hist. N. Y., ix, p. 351, 1870; P. opercularis 

 Gould. — Clessin, Conch. Cab., ed. 11, xvii, p. 33, 1886. —Wester- 

 lund, Act. Acad. Sci. Slav. Merid., Zagrabia;, CLI, p. 120, 1902, P. 

 boissyi Pot. et Mich. 



Heterodiscus Westerlund, op. cit., 1902, not of Sharp, 1886, Insecta. P. 

 libaniciis Westerlund. 



Section Drepanotrema Crosse and Fischer. 



Drepanotrema C. and F. , Miss. Sci. Mexique, 11, pp. 59, 75, pi. xxxill, fig. 

 2, 1880; P. y-abalensis C. & F. ; Fischer, Man., p. 509, 1883. 



