36 Remarks on Classifications of 



6. Conulus (Fitzinger) Moq.Tand. - 



T. imperforata, vel angustissime perforata, turbinata, arctispira ; anfr. 

 o-G, convexiusculi ; apertura depresso-lunaris, anfr. penultirao vakle 

 excisa, parura obliqua. Perist. marginibus remotis. 



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

 Tentacula inferiora crassa. 



7. Gastrodonta Albers. 



j". subperforata vel umbilicata, orbicnlato-convexa, cornco-diapbana, 

 vitrea, plus miuusve ruguloso-striata ; anfr. 5-7 ; apertura lunaris, basi 

 dentibus pliciformibus, tnarginem non attingentibus, saepissirne ruunito ; 

 perist. simplex, acutum. 



GENUS XII. 



Macroctclis Beck. 



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

 4|-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 XV. 



Helix L. 



T. discoidea, globosa vel conoidea, apertnra transversa, obliqua, lunaris 

 vel rotundata, marginibus distinctis. 



Maxilla arcuata, perpendiculariter costata, margine crenato. Dentes 

 linguales numerosi, medii trifidi, laterales bifidi, breves. 



(Sagitta amatoria in plerisque.) 



2. Microphysa Albers. 



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

 sutura distiucta ; anfr. 4-5 convexiusculi, lente accrescentes, ultimus non 

 descendens; apertura lunar i-ro tundata ; perist. tenue, simplicissimum, 

 marginibus convergentibus. 



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, 



