156 ARIONID^ 



2. Goniodiseus ruderatus (Studcr MS., Ferussac). 

 Etym. : — Lat. ruderatus, covered with rubbish. 



1820, Helix ruderata, mihi [n. 7iud.] : Studer, Naturw. Anz. 



Schweiz. Gesell., iii, p. 86. (Reprint, " Syst. 

 Verzeichn.," p. 12.) 



1821. Helix (Helicella) ruderata, Studer : Ferussac, Tabl. sijst. 



Limaqons, Jan. ed., p. 44 (June ed., p. 40) ; 



Hist., pi. Ixxix, f. 6. 

 1823. Helix rotundata, var. p : Nilsson, Hist. Moll. Svecice, 



1822 {i.e. 1823], p. 31. 

 1828. Helix ruderata, Studer : C. Pfeiffer, Naturg. Deutsch. 



Moll, iii, p. 30, pi. iv, f. 26. 

 1828,| Helix umhilicus, Mrkl. : Menke, Synof. Moll., p. 11, 

 Feb. / in synon. 



1833. Discus ruderatus, mihi : Fitzinger, Beitr. Landesk. 



Oesterr., iii, p. 99. 

 1837. Helix (Delomphala) ruderata, Studer : Charpentier, 



Neue Denlschr. Allg. Schweiz. Gesell., i 



[no. 2], p. 12. 

 1837. Helix {Eyryomphala) ruderata. Stud. : Beck, Index 



Moll, p. 9. 

 1837. Patida ruderata. Stud. : Held, Isis, xxx, hft. 12, col. 916. 

 1847. Helix (Euryomphala) ruderata. Stud. : I3eck, Amtl Ber. 



24. Versamtn. Deutsch. Naturf., p. 122. 

 1850. Helix (Patula) ruderata, Stud. : Albers, Heliceen, p. 64. 

 1855. Discus ruderatus. Stud. : H. & A. Adams, Genera Moll, 



ii, p. 117. 

 1876. Pahda (Patularia) ruderata, Stud. : Clessin, Deutsch. 



Excur. Moll Fauna, p. 88, f. 39. 



1893. Pyramidtda [Gomjodiscus) ruderata. Stud. : Pilsbry, 



Manual Conch., Ser. II, vol. ix, p. 47. 



1894. Patula {Discus) ruderata, Studer : Weiss, Nachrbl. 



Deutsch. Malal: Gesell., xxvi, p. 151. 

 1909. Pyramidula (Discus) ruderata (Studer) : Taylor, Monog. 

 Moll Brit. Is. [iii], p. 196, figs. 



First recorded as British in 1843, by J. Morris [Cat. Brit. 



Foss., p. 148), from the Copford post-tertiaries. 

 British Distribution in Time : Cromerian to Holocene. 



Fam. : ARIONID^. 



Gemis : 1. ARION, Ferussac. 



Etym. : — Named after 'AptW, the lyric poet and player. 

 Type : — Arion empiricorum, Ferussac = Limax ater, Linnseus. 



{Cf. Pilsbry, Nautilus, xxxv, 117.) 

 {Limax, vett. auctt.) 



1819. Arion : Ferussac, Hist, Nat. Moll, ii, pp. 50 & 53. 



