62 The Molluscan Family Planorbidae 



Subgenus BATHYOMPHALUS (Agassiz MS) Charpentier, 1837 

 Type Helix contorta Linn, designated by Herrmannsen in 1852 



1837. Bnthyomphalus Agassiz (MS) Ch.arpentier, Neue Denkschr. AUg. Schweiz. 



Gesell., I, no. 2, p. 20. 

 1847. Polygyrus Gr.\y, Proc. Zool. Soc, p. 181. T^-pe Planorbis contortus (Linn.) (not 



of Say, 1818, or Beck, 1837). 

 1850. Discoidina Stein, Leben. Schneck. und Musch. Berlins, p. 82. Type Planorbis 



contortus (Linn.). 



1852. Bathi/omphahis Herrm.annsen, Ind. Gen. Mai., II, Suppl., p. 16. Type Planorbis 

 coJitortus (Linn.). 



1855. Bathyomphalus Moquin-T.\ndon, Hist. Nat. Moll. France, II, p. 443. As sub- 

 genus. 



1870. Bathyomphalus D.\ll, Ann. X.Y. Lye. Nat. Hist.. IX, p. 352. Type Planorbis 

 contortus (Linn.). As subgenus. 



1883. Bathyomphalus Fischer, Man. Conch., p. 507. Tyi)e Helix contorta Linn. As 

 section of Planorbis. 



1885. Bathyomphalus Westerluxd. Fauna Palaearc. Reg.. V, p. 65. No tyjie cited. 



1886. Bathyomphalus Clessix, Conch. Cab., XVII, p. 34. Type Planorbis contortus 



(Linn.). As subgenus. 

 1902. Bathyomphalus Westerluxd, Rad. Jugoslav. Akad., 151, p. 120. Type Helix 



contortus Linn. As genus of Planorbis. 

 1905. Bathyomphalus Dall, Alaska Moll., pp. 83, 86. Type Planorbus contortus 



(Linn.). As section of Planorbis. 

 1917. Bathyomphalus Soos, Ann. Musei Nat. Hungarici, XV, pp. 45, 142. Type 



Bathyomphalus contortus (Linn.). As subgenus. 

 1921. Bathyomphalus Germ.mn, Rec. Ind. Mus., XXI, p. 7. Type Planorbis contortus 



(Linn.). As subgenus of Planorbis. 

 1923. Bathyomphalus Wenz, Fossil. Cat., Pars 22, p. 1633. Genotype Bathyomphalus 



contortus (Linn.). As genus. 

 1926. Bathyomphalus Lixdholm, Archiv. fiir Mollusk.. 58 year. Heft 6, p. 253. Mon- 



ogenotype Planorbis contortus (Linn.). As genus. 

 1926. Bathyomphalus Kexx.ard and Woodward. Syn. British Non-marine Moll., p. 68. 



Type Helix contorta Linn. As subgenus of Planorbis. 

 1929. Bathyomphalus H.aas, Trab. Museo Cien. Nat. Barcelona, XII, j.. 383. Type 



evidently Planorbis contortus (Linn.). As genus. 

 1931. Bathyomphalus Germ.^in, Moll. Terr. Fluv. France, II, p. 520. Type evidently 



Planorbis contortus (Linn.). As subgenus of Planorbis. 

 1931. Bathyomphalus Thiele, Handbuch, IV, Teil 2, p. 481. Type Anisus (B.) con- 

 tortus (Linn.). As subgenus of Anisus. 

 1935. Bathyomphalus Soos, Allat. Kozlem., XXXII, p. 30. Planorbis contortus (Linn.) 



cited. As genus. 



Shell (plate 77, figs. 23-25). Small, ultradextral with the whorls more 

 nimierous and more closely coiled than in Anisus, increasing very slowly 

 in diameter, equally visible above and below, but the spire whorls (left 

 side) forming a wide depression, a false umbilicus, not present in Anisus. 



Animal. Not difi^ering in general characteristics from Anisus. 



ANATOMICAL CHARACTERISTICS 

 PLATE 3 



GENITALIA. Male Organs (fig. 10) . Seminal vesicle (SV) very long 

 (3.5 mm.), of larger diameter than the ovisperm duct with many small 

 tuberculous glands protruding from the surface. Prostate long (about 

 3 mm.) and composed of forty-eight to fifty relatively short and wide 



