jMdl (i)id BitrtscJi — TIte Pijratnidelllihv. 11 



Spiral cords subtHjually spaced beUvoon tlie sutures, 

 where the .sculpture is nutlulose; buse sjiiruU^' Urate 

 and axialiy striated 



Subg. ChrysaJlida Carpeuter, KSoO. 

 T^pe, Vhemnitzia comnn/nh 



C. n. Ads. 



Spiral markin.iis consisting of impressed lines 



Spiral strialious sultecpially spaced, present between 

 the sutures an<l on tjic l)ase of the whorls 



Subg. Fvrgulina A, Adams, 18G4. 



Type, ChryadUida aiMa A. Ads. 



Spiral striations on the base only, periphery deeply sul- 

 cated, a.xial ribs e.xtending to the umbilical region 

 Egila subg. nov. 

 Type, Chrymllida lacxinaUi Cpr. 



Spiral striations on the base only, axial ribs terminat- 

 ing at the periphery, which is not sulcated 

 Subg. Spiralinella Chaster, 1901. 



Type, Turbo spiralis Montagu. 



C- Axial ribs pre.sent, lamellar 

 Spiral markings lamellar 



Ribs and spiral lamelUe moderately strong, siibequally 

 sjiaced between the sutures and on the base; sculp- 

 ture cuspidate 



Haldra subg. now 



Tyj.^, Chry^dllkla fhotis Cpr. 



Ribs and spiral lamellae few, very strong 

 IviJia subg. nov. 

 Type, Parthenia armnta Cpr. 



C' 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 crenulaled 

 Subg. Miralda A. Adams, 1S()4. 



Type, Parthenia diadxma A. Ads. 



Spiral markings consisting of many subequally spaced lira- 

 tions 

 Whorls tabulated at the summit 



Subg. Ivara Dall and Bartsch, 190:J. 

 Type, OdoHtomia [Ivara) turricula I). «fe B. 



