A New Classification of the Family Planorbidae 49 



Siil)family SEGMENTININAE F. C. Baker (New) 



Genus Segmontina Fleming, 1817 Planorbis nitidus Mtiller 



Genus Hippeutis (Ag.) Charj)., 1837 Planorbis complanatus Drap. 



Genus Polypylis Pilsi)rv, 1906 Planorhis largillurli, Phil. 



Genus Helicorbis Benson, f 1855 Planorbis umbilicalis Benson 



Genus Trochorbis Benson,! 1855 Trochorbis trochoid iics Benson 



Genus Pingiella F. C. Baker (New) Pyramidula pi'ipinoi-^lx Ping and Yen 



Genus Intha Annandale, 1922 Intha capitis Annandale 



Genus Drepanotrema P^ischer and Crosse, 1880 



Subgenus Drepanotrema SS Planorbis anatinum Orb. 



{=yzabalensis C. and F.). 



Subgenus Fossulorbis Pilsl)rv, 1934 Planorbis cnltratus Orb. 



Genus l'arai)l:in()rl)is Ilanna,! 1922 Planorbis condoni Hanna 



Genus Platytaphius Pilsl)ry,t 1924 Planorbis hcteroplearus P. and V. 



Genus Acrorl^is Odhner, 1937 Acrorbis petricola Odhner 



Subfamily HELISOMATINAE F. C. Baker, 1928 



Genus Helisoma Swainson, 1840 



Subgenus Helisoma SS Planorbis anceps Menke 



{ = bicarinatus Sowb.) 



Subgenus Seminolina Pilsl^ry, 1934 Physa scalaris Jay 



Subgenus Pierosoma Dall, 1905 Planorbis trivolvis Say 



Subgenus Planorbella Haldeman, 1842 Planorbis campanulatus Say 



Genus Carinifcx W. G. Jiinney, 1863 Planorbis newberryi Lea 



Genus Vorticifex Meek, J 1870 Carinifex tryoni Meek 



Genus Perrinilla Hannibal, J 1912 Helisoma cordillerana Hannibal 



Geiuis Parapholyx Hanna, 1922 Pomplinhjx effiisa Lea 



Genus Pompholopsis Call,! 1888 Pontjiholap-sis irhitei Call 



Genus Planorbarius Froriep, 1806 Hdix contra Linn. 



Subfamily PLANORBULINAE Pilsbry, 1934 



Genus Planorbula Haldeman, 1840 



Subgenus Planorbula SS Planorbis armigerus Say 



Sul:)genus Haldemanina Dall, 1905 Planorbis icheatleyi Lea 



Genus Promenetus F. C. Baker, 1935 Planorbis exacuous Say 



Genus Menetus H. and A. Adams, 1855 



Subgenus Menetus SS Planorbis opercularis Gould 



Subgenus Mieromenetus F. C. Baker (New) . . . Planorbis dilatatus Gould 



Genus Planorbifex Pilsbry, J 1934 Planorbis vanvlecki Arnold 



Groups of Uncertain Affinities 



Genus Choanomphalus Gerstfeldt,t 1859 Choanomphalus maacki Gerstfeldt 



Genus Poecilospira Morch,! 1853 Valvata multiformis Zeiten. 



tThe anatomy is not known for any member of this group. 

 ♦ A group represented by fossils only. 



