Dull and JBartsch The Pyramidellidce. 9 



/'. 



B 2 Varices present 



Surface marked by axial ribs and strong spiral 

 striations 



Subg. Mormula A. Adams, 1864. 



Type, Mormula risaoina A. Ads. 



Surface marked by axial ribs and strong spiral lira- 

 tions, sculpture granulose 



Subg. Lancella nom. nov. 



Type, Tarbonilla (Lancea) elongata 



Pse. 



A 2 Shell with basal keel 



Axial sculpture consisting of strong ribs 

 Spiral sculpture absent 



Asmunda subg. nov. 



Type. Chemnitzia turrita C. B. Ads. 



Spiral sculpture present 



Spiral sculpture consisting of strong ridges 

 Subg. Peristichia Ball, 1889. 



Type, Peristichia toreta Ball. 



Spiral sculpture consisting of two tumid ridges 

 one at the periphery the other at the summit 

 of the whorls and many fine striations in the 

 intercostal spaces 



B ildra subg. nov. 



Type. Turbonilla (Baldra) archeri 



sp. nov. 



Axial sculpture consisting of lines of growth only 

 Spiral sculpture consisting of faint lirations 

 Discobasis Cossmann, 1888. 

 Type, Aciculina demissa Besh. 



SYNOPSIS OF THE SUBGENERA OF ODOSTOMIA. 



; ' 



A 1 Postnuclear whorls sculptured similarly throughout 

 B 1 Varices absent 



C 1 Axial ribs present, rounded 



Spiral markings, when present, consisting of mere micro 

 scopic striations 

 Shell inflated 



Summit of the whorls slightly shouldered 

 Subg. Elodiamea Be Folin, 1884. 



Type, Elodia elegans Be Fol. 



. 



' , 



