87 



4. Helicina Guildingiana Pfr. (Nr. 32.) 

 T. depressa, tenuiuscula, sub lente subtilissime gra- 

 nulata, fliaphana , straminea vel albida, infra suturam 

 f'ulvo-unifasciata; spira brevis, convexa; anfr. 4 vix con- 

 vexiuscub', ubimus subdepressus, basi vix convexior; aper- 

 (ura obb'qua, subtriangulaii-semiovabs; coluineila brevis» 

 excavata, antrorsum in denticuluin desinens, retrorsum in 

 calluin tenuem, semicircularem, flavescenleni expansa; pe- 

 rist, (enne , breviter reflexum , margine supero repando, 

 basali incisura levi a columella separate. — Diam. maj. 8, 

 min. 6Va, alt. 4'/2 mill. 

 Habitat . . . ? 



6. Helicina turbinata Wiegmann mss. (Nr. 47.) 

 T. turbinata, solidula, sublaevigata, opaca, alba uni- 

 color (rarius fusculo-unizonata vel f'usco-carnea); spira 

 turbinata, acutiuscula; anfr, 6 subplani, ultimus interdum 

 obsolete angulatus; apertura semilunari-triangularis; colu- 

 mella brevis, arcuata, superne rima impressa signata, basi 

 subtuberculata , incrassata, retrorsum in callum basalem 

 diffusum abiens; perist. subincrassalum, breviter expan- 

 sum. — Diam. maj. 11, min. OVs? alt. 9Vs miH- 

 Habitat in Mexico. 



Mit Hei. zephyrina Ducl. am nächsten verwandt, doch 

 trotz grosser Veränderlichkeit in einigen Charakteren be- 

 sonders durch die Form der Mündung leicht zu unter- 

 scheiden. 



ß, Helicina alata Menke mss. (Nr. 56.) 

 T. globoso-conica, tenuis, striatula, sub epidermide 

 decidua, fuscula alba; spira conica, acutiuscula; anfr. 

 ö'/a convexi, ultimus rotundatus, non descendens, basi 

 juxta callum columcliaren) circumscriptum profunde im- 

 pressus; columella simplex, recedens; apertura ampia, 

 semicircularis; perist. simplex, tenue, expansiusculum, 



