NO. 2 PYRAMIDELLID MOLLUSKS BARTSCH 7 



Columellar folds not 3. 

 Columellar folds 2. 



Outer lip reinforced by internal spiral cords Locklinia 



Outer lip not reinforced by internal spiral cords. 



Aperture subquadrate Eidimella 



Aperture oval (Cossmatmica) 



Columellar folds i. 

 Shell umbilicated. 



Peripheral sulcus present (Sulcorinella) 



Peripheral sulcus absent Orinella 



Shell not umbilicated. 



Parietal wall with a spiral cord. 



Spiral cords present on the whorls Peristichia 



Spiral cords absent on the whorls Ugartca 



Parietal wall without spiral cord. 

 Shell elongate-turrited. 



Sculpture confined to axial ribs (Chemnitsia) 



Sculpture consisting of axial ribs and 

 spiral cords. 



Varices present Mormula 



Varices absent. 



Whorls strongly shouldered Bartschella 



Whorls not strongly shouldered. 

 Spiral sculpture consisting of 



cords Pyrgisciis 



Spiral sculpture consisting of 



cords and incised lines Striopyrgus 



Shell not elongate-turrited — pupoid, ovate, or 

 elongate-ovate. 



Axial ribs present. 



Axial ribs only present. 



Varices present Salassia 



Varices absent (SalassicUa) 



Axial ribs and spiral cords present. 



Base umbilicated lolaea 



Base not umbilicated. 



Sculpture uniformly nodu- 

 lose Chrysallida 



Sculpture not uniformly nod- 

 ulose. 

 Supraperipheral cord 



with nodules (Miraldella) 



Supraperipheral cord 



without nodules Fargoa 



Axial ribs absent. 



Periphery keeled Eulimastoma 



Periphery not keeled. 



Shell with spirally incised lines. . . (Evalea) 

 Shell without spirally incised 

 lines Odostomia 



3 Names in parentheses are subgenera. 



