PLANORBIS 85 



1913. Planorhis (Paraspira) spirorbis, Linne : Germain, Moll. 

 France, ii, p. 255, f. 302 & 309. 



First definitely recorded as British in 1912, it liaving 

 been previously confused with P. leucosloma, by 

 Kennard & Woodward {Quart. Journ. Geol. Soc, 

 Ixviii, p. 237). 



British Distribution in Time : Pliocene to Recent. 



13. Planorbis (Spiralina) leucostoma, Millet. 



Etym. : — Gr. Xsuko's, white + o-ro/xa, a mouth. 



?1801. Planorhis rotundatus : Poiret, Coq. Aisne, p. 93. 

 ?1805. Planorhis vortex, var. p : Draparnaud, Hist. Moll. 



France, p. 44. [Fide Millet, but is more 



likely P. spirorbis.] 

 1813. Planorbis leucostoma : Millet, Moll. Maine & Loire, 



p. 16. 

 1821. Planorbis spirorbis, Miill. : C. Pfeiffer, Naturg. Deutsch. 



Moll, i, p. 79, pi. iv, f. 8. 

 1826. Planorhis nitidus [pars] : Risso, Hist. Nat. Europ. 



merid., iv, p. 98. [Fide Bourguignat.] 

 1831. Planorbis leucostoma, Millet : Michaud, Complem. Hist. 



Moll. France Drap., p. 80, pi. xvi, f. 3-5. 

 1833. Planorbis spirorbis, Miill. : Rossmassler, Icon., i, p. 106, 



f. 63. 

 1840. Planorbis vortex, Linn, [pars] : Gray, in Turton's Manual, 



new ed., p. 267! 

 1850. Planorbis {Spirodiscus) leucostoma : Stein, Lebend. 



Schneck. d Musch. Berlins, p. 74. 

 1850. Planorbis Perezii, Graells MS. : Dupuy, Hist. Nat. Moll. 



France, p. 441, pi. xxv, f. 6. 

 1850. Planorbis septemgyratus, Rossm. : Dupuy, o. c, p. 441, 



pi. xxi, f. 8. [Non Rossmassler.] 

 1852. Planorbis spirorbis, Linnaeus [pars] : Forbes & Hanley, 



Brit. Moll., iv, p. 159, pi. cxxvii, f. 9 & 10. 

 ?1854. Planorbis fragilis, Millet : Millet, Atm. Soc. Linn. 



Maine & Loire, i, p. 291. 



1855. Planorbis {Spirorbis) leucostoma, Mich. : H. & A. Adams, 



Genera Moll., ii, p. 263. 



1856. Planorhis {Gyrorbis) rotundatus, Poir. : Moquin-Tandon, 



Hist. Moll. France, ii, p. 435, pi. xxx, f . 38-46. 



1857. Planorhis vortex, Linu. [pars] : Gray, in Turton's 



Manual, new ed., p. 242. 



1862. Planorbis spirorbis, Miiller [pars] : Jeffreys, Brit. 



Conch., i, p. 87 ; v, pi. v, f. 5. 



1863. Planorbis spirorbis, Liiina>us [pars] : Reeve, L. & 



F.-W. Moll. Brit. Is., p. 145, figs. 

 1868. Planorbis Dazuri : MoRcn, Amcr. Journ. Conch., iv, 

 p. 32. 



