FAMILY LYMN^EIDJE 83 



Section BATHYOMPHALUS Agassiz. 



Bathyomphalus AGASSIZ, in Charpentier, Fauna Helv. , p. 20, 1837 ; P. contortus 

 Drap. HARTMANN, Syst. Uebers. Cast., table, 1840. WESTERLUND 

 Acta Acad. Sci. Slav. Merid., Zagrabias, CLI, p. 120, 1902. 



Polygyrus GRAY, P. Z. S., 1847, p. 181 ; P. 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 Gyraulus Agassiz. 



Gyraulus AGASSIZ, in Charpentier, Fauna Helvetica, p. 21, 1837 ; 1st sp. P. 



hispidus Drap. (= alb us Miiller). HARTMANN, Syst. Uebers., table, 



1840; Cast., v, pp. 89, 95, 1844. MOQUIN TANDON, Hist. Moll. Terr. 



et Fluv., n, p. 438, 1855. 

 Planaria BROWN, 111. Conch. Gt. Brit., expl. pi. 51, figs. 48, 49^, 1827 ; 



not Planaria Miiller, 1776. 



Trochlea HALDEMAN, Am. Journ. Sci., XLII, p. 216, 1841. 

 Giraulits MOQUIN TANDON, Hist. Moll. Terr, et Fluv. de France, 11, p. 423, 



1855. 



Nautilina (pars) STEIN, Schn. u. Muscheln Berlins, p. 80, 1850. 

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

 Gyrauhts GRAY, op. cit., p. 234, 1857, P. albus Miiller. WESTERLUND, 



Acta Acad. Sci. Slav. Merid., Zagrabiae, CLI, p. 121, 1902. 



Section ARMIGER Hartmann. 



Armiger HARTMANN, Syst. Uebers., table, 1840; Gast., v, p. 172, 1842 ; P. 



crista (L.). WESTERLUND, Acta Acad. Sci. Slav. Merid., CLI, p. 121, 



1902. 

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



Section TORQUIS Dall, nov. 

 Type P. parvus Say. 



(Incerte sedis.} 



? Section HETERODISCUS Wester lund. 



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

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

 libanicus Westerlund. Not Heterodiscus Sharp, Insecta, 1886. 



/= Planorbina HALDEMAN, 1842, q. v. 



The genus Planorbis is frequently ascribed to Guettard or Geoffrey, 

 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 1702 for a 

 species which Linne 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, by some error cites Planorbis corneus as Adanson's type, which 



