12 Dull and Bartsch — The Pyramidellidce. 



Whorls not tabulatpd 



Evalina subg. nov. 

 Tyi)e, Odontomia (Evalina) americana 



sp. nov. 



C^ Axial ribs usually reduced to mere lirations, frequently only 

 present between the spiral ridges 



Spiral markings consisting of moderately well developed 

 cords usually equally spaced and present betM'een the 

 sutures and on the base; axial ribs indicated by faint 

 threads between Ihe spiral sculpture 

 Shell umbilicated 



Subg. lolaea A. Adams, 1867. 



Type, Lde scitula A. Ads. 



Shell not umbilicated 



Subg. Menestho MGller, 1842. 



Type, Turbo ulbulim Fabr. 



Spiral markings consisting of strongly raised lamellte; axial 

 ribs indicated b}' raised threads 



Subg. Odelta Ue Folin, 1870. 



Type, OdoHtomia (Odetta) caUipyrga 

 nom. nov. ^ Odetta elegans De Fol. 



C' Axial ribs absent; axial sculpture represented by lines of 

 growth only 

 Spiral markings consisting of manj-, usually siibequally and 

 universally distributed impressed lines 

 Shell elongate-conic 



Subg. Evalea A. Adams, 1860. 



Type, Evalea elegans A. Ads. 



Shell short, subglobose 



Subg. Oda Monterosato, 1901. 



Type, Odostomia dolioliformis Jeffr. 



C'' Axial sculpture absent, shell polished 



Spiral markings consisting of two tumid ridges, one at the 

 periphery and the other at the summit of the whorls 

 Subg. Cyc'odostomia Sacco, 1892. 



Type, Cydodostomia mutinensis S&cco. 



Spiral markings consisting of a more or less conspicuous 

 tumid ridge on the summit of the whorls 



Subg. Doliella Monterosato, 1880. 

 Type, Odostomia nitens Jeflfr. 



