HELICIGONA. 305 



reflexed, baso-columellar lip straightened or arcuate, its edge broadly 

 dilated and reflexed. Type H. raspailii, pi. 43, figs. 33, 34, 35. 



Jaw (of H. raspaili) arched, with three separated ribs. Epi- 

 phragm flat, thin and membranous, with some calcareous particles. 

 Genital system furnished with a curved dart (pi. 63, fig. 7 H. ras- 

 pailii) 10-12 mill, long, swollen and channelled at base, then con- 

 stricted, widening again in the middle, four bladed (?). Mucus 

 glands four-fingered. 



This group has the characteristic shell of Campylcea, but the four- 

 fingered mucus glands and the apparently quadrangular dart are 

 characters like Tachea and Otala. It may prove to be a transition 

 group. A further investigation is needed to demonstrate its affini- 

 ties, and especially should the dart and the diverticulum of the 

 spermatheca duct be examined, as these structures afford the only 

 criterion for the separation of the true Helices from the Campylcea 

 or Helicigona group. The species are all from Sardinia and Cor- 

 sica. 



H. raspailii Payr., iv, 112. H. cyrniaca Dut., iv, 112. 



v. acropachia Mab. revelierii Deb., iv, 112. 



v. lenelaia Mab. planospira Payr. 



v. pilosa Kob., iv, 112. tachigyra West. 



v. garciai Hagenm. v. montigena Hagen. 



H. insularis Cr. & Deb., iv, 112. v. faucicola Hagen. 

 H. brocardiana Dut., iv, 112. H. gennarii Paul., iv, 113. 



v. omphalophora Dut. H. carotii Paul., iv, 112. 



v. sciaphila Hagenm. /. major, unifasciata, viperina, 



v. donata Hagenm. lamarmone, spectrum, Mal- 



zan, iv, 113. 

 H. melonii Malz., iv, 113. 



Un figured forms : H. vittalacciana Mab., romagnolii Dut., melli- 

 . niana with var. deschampsiana, and aritsalensis Hagenmtiller. 



Section Arianta Leach, 1831. 



Arianta LEACH in Turton's L. and Fw. Shells Brit. Is., p. 35' 

 (for H. arbustonmi). BECK, Index, p. 41 (in part). HARTMANN, 

 Gast. Schw., p. 55.Ariotita v. MARTENS, Die He!., I860, p. 127, 

 (exclusive of all but type, H. arbustorum). Not Arionta of Ameri- 

 can authors ! 

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