FAMILY LYMN^ID^ 83 



Section Bathyomphalus Agassiz. 



Bathyomphalus A.GKS,siz, in Charpentier, Fauna Helv., p. 20, 1837 ; P. contortus 

 Drap. — Hartmann, Syst. Uebers. Gast., table, 1840. — Westerlund 

 Acta Acad. Sci. Slav. Merid., Zagrabise, cli, p. 120, 1902. 



Polygyrtts Gray, P. Z. S., 1847, p. 181 ; /l contortus Miiller ; not of Beck, 

 1837, nor Polygyra Say, 1818. 



Bathyomphalus Gray, in Turton, Man., 2d ed., p. 244, 1857. 



Discoidina Stein, Schn. u. Muscheln Berlins, p. 82, 1850 ; P. contortus 

 Miiller. 



Subgenus Gyxaulus Agassiz. 



Gyraulus Agassiz, in Charpentier, Fauna Helvetica, p. 21, 1837 ; ist sp. P. 



hispidus Drap. {= aibus Miiller). — Hartmann, Syst. Uebers., table, 



1840; Gast., V, pp. 89, 95, 1844. — MoQUiN Tandon, Hist. Moll. Terr. 



et Fluv., II, p. 438, 1855. 

 Planaria Brown, 111. Conch. Gt. Brit., expl. pi. 51, figs. 48, 49<5w, 1827; 



not Planaria Miiller, 1776. 

 Trochlea Haldeman, Am. Joum. Sci., xlii, p. 216, 1841. 

 Giraulus MoQUiN Tandon, Hist. Moll. Terr, et Fluv. de France, 11, p. 423, 



1855. 

 Nauttlina (pars) Stein, Schn. u. Muscheln Berlins, p. 80, 1850. 

 Gyrulus Gray, in Turton, Man., 2d ed., p. 234, 1857, in syn. 

 Gyraulus Gray, op. cit., p. 234, 1857, P. albus Miiller. — Westerlund, 



Acta Acad. Sci. Slav. Merid., Zagrabiae, cli, p. I2i, 1902. 



Section Armiger Hartmann. 



.<4rw«^^r Hartmann, Syst. Uebers., table, 1840; Gast, v, p. 172, 1842 ; P. 



crista (L.). — Westerlund, Acta Acad. Sci. Slav. Merid., cli, p. I2i, 



1902. 

 Nautilina (sp.) Stein, Schn. u. Muscheln Berlins, p. 81, 1850. 



Section Torquis Dall, nov. 



Type P. parvus Say. 



{^Incerte sedis.^ 



? Section Heterodiscus Westerlund. 



Heterodiscus Westerlund, Rad. Jugoslav. Akad. (Acta Acad. Sci. Slav. 

 Merid.), cli, p. 120, Zool. Rec, XL, 1903, Moll., p. 63. Type Planorbis 

 //^a«zV«j Westerlund. '^ot Heterodiscus ^\iz.v^, Insecta, 1886. 



.? = Planorbina Haldeman, 1842, q. v. 



The genus Planorbis is frequently ascribed to Guettard or Geoffroy, 

 neither of whom accepted (in the papers where this name appears) the 

 Linnean nomenclature. If we are to cite non-Linnean authors we 

 must go back much further, for Petiver used the name in 1 702 for a 

 species which Linn6 afterward named Helix spirorbis. Another 

 non-Linnean name is Coretus of Adanson, which he applied to a 

 minute species an eighth of an inch in greatest diameter. Gray in 

 1847, ^y some error cites Planorbis corneus as Adanson's type, which 



