12 Dall and Bartsch The Pyramidellidaz. . 



Whorls not tabulatPd 



Evalina subg. nov. 

 Type, Odoxtomia (Evalina) americana 



sp. nov. 



C 4 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 between the 

 sutures and on the base; axial ribs indicated by faint 

 threads between the spiral sculpture 

 Shell umbilicated 



Subg. lolaea A. Adams, 1867. 



Type, lole scitula A. Ads. 



; 



Shell not umbilicated 



Subg. Menestho Moller, 1842. 

 Type, Turbo albulus Fabr. 



Spiral markings consisting of strongly raised lamellae; axial 

 ribs indicated by raised threads 



Subg. Odetta De Folin, 1870. 



Type, Odortomia (Odetta} callipyrga 

 nom. nov. = Odetta elegans De Fol. 



C 5 Axial ribs absent; axial sculpture represented by lines of 

 growth only 



Spiral markings consisting of many, usually subequally 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 6 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. CycFodostomia Sacco, 1892. 



Type, Cyclodostomia mutinensis Sacco. 



Spiral markings consisting of a more or less conspicuous 

 tumid ridge on the summit of the whorls 



Subg. Doliella Monterosato, 1880. 

 Type, Odostomia nitens Jeffr. 



