282 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



Breathing pore absent. 



Breathing device reduced to a notch. 



Axial sculpture predominant- ._ Fossularia 



Spiral sculpture predominant Eutudoriaca 



Breathing device absent. 



Lamella of operculum reeuforced with strong, retrac- 



tively slanting riblets Diplopoma 



Lamella of operculum not reenforced with strong, re- 

 tractively slanting riblets. 



Shell ranging from elongate-conic to elongate- 

 ovate. 



Spiral sculpture on spire present. 



Axial sculpture articulated Juannularia 



Axial sculpture not articulated. 



Shell very large Annularita 



Shell not large Troachelvindex 



Spiral sculpture on spire absent. 



Postnuclear whorls solute Blaesospira 



Postnuclear whorls not solute. 



Postnuclear whorls spinose Quajaibona 



Postnuclear whorls not spinose. Subannularia 

 Shell not ranging from elongate-conic to elon- 

 gate-ovate. 



Shell depressed-helicoid Annularisca 



Shell not depressed-helicoid. 

 Shell of turbinid shape. 



Axial and spiral sculpture present 



on spire Annularex 



Peristome simple Bermudezia 



Peristome double Lugarenia 



Axial and spiral sculpture not pres- 

 ent on spire. 



Axial and spiral sculpture 



obsolete Aimularosa 



Axial and spiral sculpture not 

 obsolete. 



Operculum with strong 



lamella Annularella 



Operculum with obsolete 



lamella Chondropomatus 



Subgenus AnntHjARODES Henderson and Bartsch 

 1920. Annularodes Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, p. 74. 



Shell elongate-ovate, openly umbilicated, marked by regular, 

 nonarticulate axial ribs and fine spiral threads on umbilical wall and 

 adjacent base; breathing pore provided with an external siphon, 

 which is directed backward, and which opens into the suture. Oper- 

 culum typically annularid. 



Type: Annularia (Annularodes) uncinata (Arango). 



