130 <:. STABILE, 



terales ut in Helice; inarglnales elongati, aculeiformes (2). Systenoa sexuala 

 simplex-, sagitta ejusque bursa, et foUiculì mucosi desnnt. Apertura respiratori» 

 latere dextro siipra collare, genitalis ad basiu colli. 



V Porus mucosus , in apice pcdis. iiullus 



Subgen. My alina, Gray 



Folliculi mucosi nulli, aut ipsosum loco adest stratum plus minusve distin- 

 ctura, glandulosum, subovatum. 



A. Conulus, Moquia-Tandon — Folliculi mucosi omnino nulli; tentacula 



inferiora crassa (Exempl: Helix fulva, ISluWer; H. se7nen-li ni, Morì- 

 cand -, etc). 



B. Euhyalina, Albers — Flagellnm breve, crassum, interdum obsoletum, 



raro uullum (Ex. //. celiarla, Miiller; H. crystallina , Miiller; etc). 



C. Mesomphix , Eafinesque — Flagellum nullum (Ex. H. incerta , Drap. 



IJ. olivctorum , Gmeliu; etc). 



D. Gastrodonta , Albers — Apertura, basi, dentlbus pliciformibus , mar- 



gincm non attingentibus munita (Ex. H. interna, S&j;H.labirynthica; 

 Say, etc). 



Subgen. IVIacroc-yclis , Beck. 



Testa tenuis, peristoma subincrassatum , vix expansiusculum; maxilla ar- 

 cuata, medio rostrata, tota costulis confertis, marginem non attingentibus; 

 exarata (Ex. //. concava, Say; H. laxata, Fér. ; etc). 



Subgen. LeU-COClaroa, Albers. {Calcarina, Moq.-Tand.) 



Systema sexualc snb-simplex; flagellum liberum, subulatum; folliculorum 

 mucosorum loco adest interdum corpus granulosum, magnum, pedunculatum. 

 Testa crassa, calcarea (Ex. E. candidissima , Drap.; H. cariosa , Olivier; 

 H. bollica , Rossmassler; etc). 



•■■(• Porus mucosus j in apice pcdis, 



Subgen. Zonites, (stricto sensu). 



Porus mucosus oblongus in apice pedis. Palpi labiales distincti. Folliculorum 

 mucosorum loco adest stratum distìnctum , truncato-ovoi'dcum. 



(i) Quand on aura examiné l'animai, il ost hicn probablc ipip plusicuic? espéce» 

 dp Helii'e* pI de Nanine» devront passcr dans lo penre Zonilef, 



