20 EemarJds on Classifications of 



6. CoNULus (Fitzinger) Moq.Tand. - 



T. im perforata, vel angiistissime perforata, turbinata, arctispira ; anfr. 

 5-6, convexiusculi ; apertiira depresso-lunaris, anfr. pennltimo valdc 

 excisa, parum obliqua. Perist. marginibus remotis. 



Maxilla carina verticali parum expressa, rostro mediano brevi, obtnso. 

 Tentacula inferiora crassa. 



7. Gastrodonta Albers. 



f. subperforata vel iiinbilicata, orbicnlato-convexa, corneo-diaphana, 

 vitrea, plus minusve ruguloso-striata ; anfr. 5-7 ; apcrtura lunaris, basi 

 dentibus pliciformibus, marginem non attingentibus, ssepissime munito ; 

 perist. simplex, acutum. 



GENUS XII. 



Macrocyclis Beck. 



T. tenuis, late umbilicata, depressa, striata vel rugulosa, concolor, anfr. 

 4-J-5, ultimus latus, depressus, antice modice descendens; apertura obli- 

 que ovata ; perist. subincrassatum vix expansiusculum, margines approx- 

 imati, basalis breviter reflexus. 



Maxilla arcuata, medio rostrata, tota costulis confertis marginem non 

 attingentibus exarata. 



GENUS XY. 



Helix L. 



T. discoidea, globosa vol conoidea, apertura transversa, obliqua, lunaris 

 vel rotundata, marginibus distinctis. 



Maxilla arcuata, perpendiculariter costata, margine crenato. Dentes 

 iinguales numerosi, medii trifidi, laterales bifidi, breves. 



(Sagitta amatoria in plerisque.) 



2. MiCROPHYSA Albers. 



T. umbilicata, depressa, tenuis, striatula, vix nitens ; spira applanata ; 

 ftutura distiiicta ; anfr. 4-5 convexiusculi, lente accrescentes, ultimus non 

 descendeps; apertura lunari-rotundata ; perist. tenue, simplicissimum, 

 jnargHiibus Goiivergentibus. 



5, Patula Held. 



T. aperte umbilicata, depressa, discoidea vel turbinata, cornea, rugosa 

 vel costulato-striata ; anfr. 4-6 aequales vel lente accrescentes ; apertura 

 lunari-rotundata ; perist. simplex, rectum, acutum, 



