• DaU and BdrtsrJi, — The Pyramidellidtv. 7 



The status of Agatha virgo A. Adams 1800, [Menfifitho, \8CA, Jfyonia, 

 1801, Amathis 1801], is not known to us. From the meager description 

 we are inclined to believe that it is allied to AcUvajrynmiu Fischer. 



SYNOPSIS OF THE SUHGENERA OF TUKBONILLA. 



Shell wilhout basal keel 

 B' Varices absent 



Spiral sculpture absent, or if present consisting of micro- 

 scopic slriations only 



Surface of the early post-nuclear whorls marked by 

 feeble axial ribs, later ones smooth 



Subg. Piycheulimella Sacco, 1892. 



Type, Fyramidella pyrunddata Desh. 



Surface marked by strong axial ribs which terminate at 

 the periphery of the whorls, intercostal spaces ex- 

 cavated between the sutures. 



Subg. Ctiemnitzia Orbigny, 18;19. 



Tv'pe, Melania campanellaf Phil. 



Surface marked by strong axial ribs and intercostal 

 spaces which extend over the periphery to the umbili- 

 cal region 



Subg. Turbonilla Risso, 1820. 



Tvne Turhomlla\ ^^^^"■'' ^' ^ ^"^ 



Spiral sculpture present, always stronger than microscopic 

 striations 

 C^ Axial sculpture consisting of well developed ribs 

 Spiral markings consisting of many very fine spiral 

 striations 

 Aperture subquadrate 



Subg. Strioturbonilla Sacco, 1892. 



Type, Strioturbonilla alpina Sacco. 



Aperture suboval 



Siibg. Pyrgolampros Sacco, 1892. 



Type, Pyrgolampros mioperplicatitlus 



Sacco. 



Spiral marking absent between the sutures, base 

 strongly spirally lirate 



Subg. Sulcoturbonilla Sacco, 1892. 



Type, Tornatella turricula Eichw. 



