I'LANORBIS 67 



1855. Trophidiscus [? err.] Stein : H. & A. Adams, Genera 

 Moll., ii, p. 263, in synon. 



1855. Omalodiscus [pars] : Bknson, Journ. Asiatic Soc. 



Bemj., xxiv, p. 127. 



1856. Gyrofhis [pars] : Moquin-Tandon, Hist. Moll. 



France, ii, p. 428. [Misattributed to Agassiz 

 in Charj)enticr, an error in which he is 

 followed by Westerlund, 1885.] [Non Fit- 

 zinger, 1833.] 

 - 1877. Tropodiscuti : Clessin, Deutsch. Excur. Moll. Fauna, 

 p. 398. 



Sub-gen. : Planorbarius, Froriep. 



Etyni. : — Lat. corrupt, of planorbicarius, pertaining to 



Pla)iorbis. 

 Type : — Helix cornea, Linne. 



1806. Planorbarius : Froriep, in Dumeril, Analyt. Zool., 



p. 165. 

 1840. Planorbis : Swainson, Treat. Malac, p. 337. 

 1847. Corctus, Adans. : Gray, Proc. Zool. Soc. Lond., 



1847, p. 180. 

 1850. Spirodiscus [pars] : Stein, Lebend. Schneck. (& 



Musch. Berlins, p. 73. 

 1880. Helisoma : Sandberger, Palaeontograph., xxvii 



(N.F. vii), p. 100. [Non Swainson, 1840.] 



Sub-gen. : Gyraulus (Agassiz MS.), Charpentier. 

 Etym. : — Gr. yupos, a circle -(- aiAds, a tube. 

 Type : — Planorbis albus, Miiller. 



1827. Planaria [pars] : Brown, Illust. Conch. Brit., 



ed. 1, pi. Ii, f. 48 & 49. [Non Muller, 



1774.] 

 1837. Gyraulus, Ag. (Msc.) : Charpentier, NeueDenkschr. 



Ally. Schweiz. Gesell., i, [no. 2], p. 21. 

 1842,) Trochlea : Haldeman, Amer. Journ. Sci., xlii, 

 Jan. / p. 216. 



1842. Armiyer : Hartmann, Erd- & SiXssw.-Gasterop., 



p. 172 (also p. 219 and " Syst. Uebersicht," 



1840). 

 1850. Naulilina : Stein, Lebend. Schneck. cfc Musch. 



Berlins, p. 80. 

 1855. Onmlodiscus [pars] : Benson, Journ. Asiat. Soc. 



Beny., xxiv, p. 127. 

 1903. Spiniformis, subg. 5 of Planorbis : Germain, Bull. 



Soc. Sci. Quest France, Ser. II, torn, iii, 



p. 204. 

 1905. Torquis, sect, of Gyraulus : Dall, Harriman 



Alaska Exped., xiii, p. 83 (defined, p. 86). 



