4 Dall and JBartsch — The PyramidelUdm. 



than in PyramideUa and larger than in Odontomia. Type, Turhonilla 

 typica D. & B.= Turbonilla j)li<'u^id(i Risso not 7'vrbo j)licatuhis Scacchi. 



Odostomia Fleming. 



Shell usually short, few whorled, svibconic or ovate; columellar fold 

 single, varying in strength, outer lip entire. Type, Turbo plicata Mont. 



Murchisonella Morch. 



Shell minute, cylindro-conic; outer lip with an anal sinus behind the 

 periphery of the whorl; pillar with the plait obsolete or internal, whorls 

 numerous and inflated. Type, Murchuonella spectrum Morch. 



SYNOPSIS OF THE SUBGENERA OF PYRAMIDELLA. 



A^ Columellar folds three 

 Shell umbi Heated 



Basal fasciole absent, surface polished, marked by extreme- 

 ly faint lines of growth and microscopic spiral- striations 

 Subg. PyramideUa Lamarck, s. s., 1799. 

 Type, Truchufi dvlabrntun L. 



Basal fasciole present, surface less polished than in PyramideUa 



s. s., marked by lines of growth and microscopic spiral 



striations 



Milda svibg. nov. 



Type, Obeliscus ventricosus Quoy. 



Shell not umbilicated. 



Surface polished, marked only by fine lines of growth and 

 microscopic spiral striations 

 Periphery sulcate 



Subg. Longchaeus MiJrch, 1875. 



Type, PyramideUa punctata Chem. 



Periphery not sulcate 



Voluspa subg. nov. 



Type, PyramideUa auricoma Dull. 



Surface sculptured 

 Basal cords absent 

 Periphery sulcate 



Shell marked by strong axial ribs which terminate 

 at the periphery, and m.icroscopic spiral striations 

 Subg. Pharcidella Dall, 1889. 



Type, PharcideUa folinii Dall. 



