Dull and Bartsch The Pyramiddlidce. . 11 



Spiral cords subequally spaced between the sutures, 

 where the sculpture is nodulose; base spirally lirate 

 And axlaily .striated 



Subg. Chrysailida Carpenter, 1850. 

 Type, Chemnitzia communis 



C. B. Ads, 



Spiral markings consisting of impressed lines 



Spiral st nations subequally spaced, present between 

 the sutures and on the base of the whorls 



Subg. Pyrgulina A, Adams, 1864. 



Type, Chrysullida ccwta A. Ads, 



Spiral striations on the base only, periphery deeply sul- 

 cated, axial libs extending to the umbilical region 

 Egila subg. nov. 

 Type, Chryxallida lacunata Cpr. 



Spiral striations on the base only, axial ribs terminat 

 ing at the periphery, which is not sulcated 

 Subg. Spiralinella Chaster, 1901. 



Type, Turbo tfpiralis Montagu, 



C 2 Axial ribs present, lamellar 

 Spiral markings lamellar 



Ribs and spiral lamellae moderately strong, subequally 

 spaced between the sutures and on the base; sculp 

 ture cuspidate 



Haldra subg. nov. 



Type, Chrymllida pJuotis Cpr. 



Ribs and spiral lamellae few, very strong 

 Ividia subg. nov. 

 Type, Parthenia armata Cpr. 



C 3 Axial ribs present but very feeble, usually only indicated near 

 the summit of the whorls 



Spiral markings consisting of several strong, broad, tumid 

 cords, one or more of the posterior cords crenulated 

 Subg. Miralda A. Adams, 18G4. 



Type, Parthenia diadema A. Ads. 



Spiral markings consisting of many subequally spaced lira- 

 tions 

 Whorls tabulated at the summit 



Subg. Ivara Dall and Bartsch, 1903. 

 Type, Odoatomia (Ivara} turricula I). & B. 



