Acta Societatis pro Fauna et Flora Fennica, Xlll, n;o 7. 191 



umbones versus declivis, margine dorsali postice declivi, 

 rostro supra et infra angustato, vix compresso, lateribus 

 arcuatis; long. 30 — 83, lat. 16 — 18, alt. 13—15 mm. — Dania 

 ad Kjobenhavn. 



Forma ampla mh., concha multo laj:ior quam alta, magna; 



long. 36—42, lat 23—27, alt. 15—16 mm. — Dania ad 



Kjobenhavn (Osterbro.) 



