

Dall and Bartsch The PyramiddlidcK. 13 



Spiral markings consisting of a strong peripheral keel 

 Subg. Scalenostoma Deshaycs, 1803. 



Type, Scalenovtvmu carinatu Desh. 



Spiral markings consisting of a peripheral sulcus 

 Subg. Jordaniella Chaster, 1898. 



Type, Turbo nivosa Montagu. 



Spiral sculpture absent or indicated only by extremely fine 

 microscopic lines of growth or striae; surface polished 

 Summits of the whorls with a strongly tabulated 

 shoulder 



Subg. Spiroclimax MCrch, 1874. 



Type, Spiroclimax tsealari* Morch. 



Summits of the whorls not tabulated 

 Columellar fold present 



Peritreme discontinuous, aperture not rissoid 

 Shell inflated, very large 



Subg. Amaura Holler, 1842. 



Type, Amaura Candida Moller. 



Shell not inflated 



Subg. Odostomia Fleming, 1817. 



Shell of medium size 

 Sect. Odostomia Fleming, s. s. 

 Type, Turbo plica ta Mont. 



Shell rather large 

 Sect Stomega nom. nov. 



Type, Odostomia conspicua Aid. 



Shell small 

 Sect. Brachystomia Monterosato, 



1884. 

 Type, Odoxtomia rissoidea Hani. 



Peritreme continuous, aperture rissoid 

 Heida subg. nov. 

 Type, Syrnola caloosaemis Dall. 



Columellar fold obsolete 

 Shell umbilicated 



Subg. Myxa Hedley, 1903. 



Type, Myxa exesa Hedley. 



Shell not umbilicated 



Peritreme continuous, aperture rissoid 

 Subg. Pseudorissoina Tate and May, 



1900. 

 Type, Stilifer tasmanica Ten-Wood. 



