PLAXORBIS 81 



1878. rianorhis {ArmUier) naulileus, Linn. : Nevill, Hand 



List Moll. Indian Mus., p. 247. 

 1903. Planorhis {Spinifonnis) cristatus, Linne [i.e. Drap.] : 



Germain, Bull. Soc. Sci. Quest France, 



Sor. II, torn, lii, p. 204. 

 1903. Planorhis (Spinifonnis) imbricatus, Miiller : Germain, I. c. 

 1912. Planorhis [Armiger) cristatus [sic], Linne : Germain, 



Arch. Mus. Hist. Nat. Lyon, xi, no. 3, p. 112. 



First recorded as British in 1784, bv Boys & Walker 



(Test, minut. rar., p. 6, pi. i, f. 20 & 21). 

 British Distribution in Time : C'romorian to Recent. 



9. Planorbis (Gyraulus) dilatatus, Gould. 

 Etym. : — Lat. dilatatus, expanded. 



1841. Planorbis dilatatus : Gould, Invert. Massachusetts, 



p. 210, f. 140. 

 1855. Planorhis (Nautilina) dilatatus, Gould : H. & A. Adams, 



Genera Moll., ii, p. 263. 

 1865. Planorbis (Gyraulus) dilatatus, Gould : W. G. Binney, 



L. <k F.'W. Shells N. Amer., ii, p. 131, f. 218. 



First recorded as British in 1869, by J. G. Jeffreys (Ann. 



ct- Ma{j. Nat. Hist., Ser. IV, vol. iv, p. 341)'. 

 British Distribution in Time : Recent. 



10. Planorbis (Spiralina) vortex (Linne). 

 Etyin. : — Lat. vorlcx, a whirlpool. 



1758. Helix Vortex : Linn^us, Syst. Nat., ed. 10, p. 770, 



no. .583. 

 1767. Helix Vortex: Linn^us, o. c, ed. 12, p. 1243, no. 667. 

 1767. Planorbis vortex, Linn. : Geoffroy, Traite Coq. Paris, 



p. 93. 

 1774. Planorbis vortex : Muller, Venn. Hist., ii, p. 158. 

 1778. Helix planorbis: DaCosta, Test. Brit., p. 65, pi. iv, 



f. 12. [Non Linne.] 

 1791. Helix vortex: Gmelin, in Linn. Syst. Nat., ed. 13, i, 



pt. 6, p. 3620, no. 30. 

 1799. Helix vortex : Pulteney, Cat. Dorset., p. 47. 

 1803. Helix vortex, Lin. : 3Iontagu, Test. Brit., p. 454, pi. xxv, 



f. 3. 

 1807. Helix vortex, Linn. : Maton & Rackett, Trans. Linn. 



Soc., viii, p. 189. 

 1813. Hdix vortex : Rackett, in Pulteney, Cat. Dorset., ed. 2, 



p. 52, pi. XX, f. 12. 

 1817. Helix vortex, Linn. : Dillwyn, Cat. Shells, ii, p. 904. 

 1820. Planorbis tenellus, mihi : Studer, Naturtc. Anz. Allg. 



Schiveiz. Gescll., in, p. 92. (In reprint, " Syst. 



Verzeichn.," p. 25.) [Fide Charpentier.] 



N.-M, MOLL. G 



