PLANORBIS 69 



Sub-gpii. : Hippeutis (Agassiz MS.), Charponticr. 



Etyin. : — CJr. i7r7r«rr)/s, a rider, in allusion to the overlapping 



(over-riding) of the successive whorls. 

 Type : — Helix complanatus, Linne. 



1837. Hippeutis, Ag. (Msc.) : Charpentiek, Neue Denh- 



schr. Allg. Schwciz. GeselL, i [no. 2], p. 22. 

 18.50. Hippcules : Gray, Fig. Moll. Anim., iv, Syst. 



arrang., p. 119. [Err. fyp.] 

 1855. Helicorhis : Benson, Journ. Asiat. Soc. Beng., xxiv, 



p. 126. 

 1880. Drepanostrema : Fischer & Crosse, Miss. Scie.nl. 



Mexique, Recherch. ZooL, Ser. VII, ii, p. 59. 



1. Planorbis (s.s.) planorbis (Linne). 



Etym. : — Lat. planus + orbis, a flat circle. 



1758. Helix planorbis : Linnjeus, Syst. Nat., ed. 10, p. 769, 



no. 578. 

 1767. Helix planorbis : Linnaeus, o.c, ed. 12, p. 1242, no. 662. 

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



p. 91. 

 1774. Planorbis uwhilicafus : Muller, Verm. Hist., ii, p. 160. 



1777. Helix planorbis, Linn. : Pennant, Brit. ZooL, ed. 4, iv, 



8vo, p. 133; 4to, p. 115, pi. Lxxxiii, f. 123. 



1778. Helix limbata: DaCosta, Test. Brit., p. 63, pi. iv, f. 8 & 



viii, f. 8. 

 1789. Planorbis complanatus, Miill. ? : Studer, in Coxe's Trav. 



Sicilzcrld., iii, p. 391. 

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



i, pt. 6, p. 3617. 



1798. Planorbis lapicida : Bolten, Mus. Bolt., ii, p. 73, no. 931. 



1799. Helix planorbis : Pulteney, Cat. Dorset., p. 46. 



. ' Planorbis acutus .- Poiret, Coq. Aisne, p. 91. 



180l,) Planorbis carinatus, b. : Draparnaud, Tabl. Mol. 



July.j France, p. 45. 



1803. Helix complanata, Lin.: Montagu, Test. Brit., p. 450; 



Suppt. pi. XXV, f. 4. 

 1805. Planorbis marqinatus : Draparnaud, Hist. Moll. France, 



p;45, pi. ii, f. 11 & 12. 

 1807. Helix planorbis, Linn, [pars] : Maton & Rackett, Trans. 



Linn. Soc, viii, p. 188, pi. v, f. 13, & f. 14 as 



H. flanata. 

 1813. Helix planorbis: Rackett, in Pulteney's Cat. Dorset., 



ed. 2, p. 52, pi. xiv, f. 8 & xx, f. 10. 



1817. Helix complanata, Linn. : Dillwyn, Cat. Shells, ii. p. 897. 



1818. Helix cochlea : Brown, Moh. Wernerian Nat. Hist. Soc, 



ii, p. 528, pi. xxiv, f. 10. [A scalariform 

 monstrosity]. 



