184 PLEURODISCIDAE. 



Middle and southern Europe, type localities Castelnau and 

 Arbois, in southern France. Algeria; Tunis j Syria. Gener- 

 ally on limestone rocks. 



Helix rupestris Dr^vparnaud, 1801, Tabl. Moll. Fr. p. 71; 

 Hist. Nat. Moll. terr. fluv. France, p. 82, pi. 7, f. 7-9.— 

 Pfeipfer, Monogr. IV, p. 71. — Westerlund, 1889, Fauna, 

 Helix, p. 13. — Helix rupestris mut. rupicola Stabile, 1859, 

 Prospetto Moll. terr. fluv. Lugano, pp. 21, 51. — Helix rupestris 

 Drap., BouRGUiGNAT, 1864, Malac. Algerie I, p. 184, pi. 16, f. 

 24-27; with Var. conoidea on expl. pi. 16, f. 31-33; Helix 

 scotaea Bgt. in coll. stated to be the same, p. 186. — Helix 

 rupestris var. meridionalis Issel, 1870, Bull. Soc. Malac. Ital. 

 Ill, p. 115. — Helix (Patula) jaenensis Clessin, 1882, Malak. 

 Bl. n. F., V, p. 187, pi. 4, f. 3. — Helix rupestris var. pinii 

 Adami, 1886, Bull. Soc. Veneto-Trentina Sci. Nat. Ill, p. 172. 

 — Patula rupestris Drap. var. dalmatina Clessin, 1887, Malac. 

 Bl. n. F., IX, p. 51. — Helix umhilicata Montagu, 1803, Test. 

 Brit. p. 434, pi. 13, f . 2. — Pfeipfer, Monogr. I, p. 86 ; Conchyl. 

 Cab. pi. 89, f. 32-35. — Turho myrmecidis Scacchi, 1833, 

 Osservazione Zoologiche I, p. 11 (not seen). — Helix aliena 

 Zgl., Pfeipfer, 1841, Symbolae ad Hist. Hel. I, p. 39. — Helix 

 spirula Villa, 1841, Dispositio Syst. Conch. Coll. Villa, p. 56 

 (Prov. Comensi). — Delomphalus rupestris saxatilis Hart- 

 MANN, 1842, Gasterop. Schweiz, p. 122. — Helix rupestris forma 

 suhglohosa "Bgt." Westerlund, 1889, Fauna Palaarct. Reg. 

 Binnenconch., Helix p. 14 (was not named by Bourguignat. 

 Westerlund evidently refers to Bourguignat 's "var. C", 

 which that author considered to be typical rupestris of south- 

 ern Europe, giving the distribution as from Spain to Beirut, 

 Syria). — Pyramidula rupestris Drap., Kennard & Woodward, 

 1926, Syn. Brit. Non-mar. Moll., p. 103 (synonymy). 



This common and widely spread species varies in size, de- 

 gree of elevation, width of the umbilicus and in sculpture. 

 I have made no study of its variations and races, but note 

 the following, the characters given being taken from the sev- 

 eral authors. 



Var. saxatilis Hartm. Differs from true rupestris by the 

 larger size, flatter shape and wider umbilicus. 2x3 mm. 

 Wiirttemberg near Waldhausen, cliffs of Ehningen, etc. A 

 specimen from Lausanne which I refer to this race measures, 

 1.7 X 2.7 mm., umbilicus one-third the diameter. PI. 25, 

 figs. 10, 10a. 



