6 Dall and JSartsch The Pyramiddlidw. 



Aperture subquadrate 



Sect. Eulimella Fbs, ss. 

 Aperture suboval 



Cossmannica sect. nov. 



Type, PyramidelUi dandestina Desh. 



A 3 Columellar fold one 

 Shell umbilicated 



Surface polished, or with fine lines of growth and microscopic 

 . spiral siriations 



Peripheral sulcus absent 



Subg. Orinella nom. nov. 



Type, Orina pinguicula A. Ads. 



Peripheral sulcus present 



Su I co rin el la subg. nov. 

 Type, Pyramidella (Sulcormella) dodo no, 



sp. nov. 



Shell not. umbilicated 



Large, heavy, elongated shells 

 Surface spirally lirate 



Subg. Actaeopyramis Fischer, 1885. 

 Type, Monoptygma atriata Gray. 



Slender, medium sized shells 



Surface polished, marked by fine lines of growth and mi 

 croscopic spiral striations 



Postnuclear whorls increasing slowly in size at first, 

 then rapidly, lending the shell a mucronate appearance 

 Subg. Styloptygma A. Adams, 1860. 



Type, Monoptygma sty Una A. Ads. 



Postnuclear whorls increasing regularly in size 

 Subg. Syrnola A. Adams, 1860. 



Type, Syrnola gracillima A. Ads. 



Aperture suboval 



Sect. Sjrnola A. Adams, s. s. 



Aperture subquadrate 



Sect. Stylopsis A. Adams, 1860. 



Type, Stylopsis typica A. Ads. 

 Surface spirally striated 



Iphiana subg. nov. 



Type, Syrnola demistriata Garrett. 



Surface axially and spirally striated with a strong spiral 

 keel at the summit of the whorls 



Syrnolina subg. nov. 

 Type, Syrnola rubra Pse. 



