268 HELICELLA. 



No penis retractor is shown in Polloneras's figures or mentioned by 

 him, so I suppose it is absent ; and it is mainly on this ground that 

 I place the group next to Theba. The hairy species may belong 

 elsewhere, but judging from the anatomy of scioana, they are better 

 placed here. The shell diagnosis given above applies to the typical 

 forms. 



H. isseli Morel., iii, 105. H. jickelii Nev., iii, 230. 



darnaudi Jick. part. H. pilifera Mart., iii, 190. 



H. lejeaniana Bgt., iii, 104. H. combesiana Bgt, iii, 190. 



darnaudi Jick. part. pilifera Jick. 



H. achilli Bgt, iii, 105. H. ferretiana Bgt., iii, 190. 



H. darnaudi Pfr., iii, 104. H. herbini Bgt., iii, 190. 



v. heuglini Mts., iii, 104. H. galinieriana Bgt., iii, 190. 



H. hamacenica Raff., iii, 250. H. beccarii Jick., iii, 189. 

 H. subnivellina Bgt., iii, 250. ciliata Morel. 



H. nivellina Bgt. H. scioana Poll., viii, 190. 



alexandrina Parr., undescr. H. d'hericourtiana B., iii, 104. 



nivea Zgl. not Gmel. H. strigelloides Poll., viii, 190. 

 H. leucosticta Mts., viii, 190. 



Section Platytheba Pilsbry, 1894. 



Nummulina KOB., Catalog Eur. Binnenconch., p. 12, 1871. Not 

 Nummulina d'Orbigny, 1826 (Polyzoa). 



Shell narrowly umbilicated, depressed and lens-shaped, acutely 

 keeled ; thin but rather solid, costulate striate, whitish. Aperture 

 quite oblique, transverse, and angular outside; peristome simple 

 above, the basal lip slightly thickened within and dilated at inser- 

 tion. Type H. nummus Ehr., pi. 68, fig. 30. 



Genital system (pi. 69, fig. 17, H. nummus) as in Theba, the 

 penis lacking retractor, flagellum very short, etc. 



These are simply keeled Carthusianas, as von Iheringhas already 

 maintained, but the shell features demand recognition by name. 

 The group is characteristic of Syria and the Caucasus region. It 

 has no alliance with Plectotropis, although the shells are somewhat 

 similar. 



H. nummus Ehr., iii, 199. H. promethus Bttg., iii, 199. 



hedenborgi Pfr. H. genezarethana Mouss., iii, 199. 



oxygyra Boiss. tiberana Mouss. 



H. spiroxia Bgt., iii, 199. H. jasonis Dub., iii, 199. 



