Dall ami 7>V/vW> The Pyramidellidce. 5 



Shell marked by strong spiral keels and weak axial 

 riblets 



Callolongchaeus subg. nov. 



Type, Pyramidella jamaicensis Dall. 



Periphery not sulcate 



Shell marked by strong axial ribs, intercostal spaces 

 strongly spirally striated, aperture auricular 

 Subg. Otopleura Fischer, 1885. 



Type, Pyramidella auris-cati Chem. 



Basal cords present 



Shell marked by strong spiral ridges, moderately 

 strong axial ribs and two basal cords 

 Subg. Triptychus Morch, 1875. 



Type, Triptychus niteus Morch. 



A 2 Columellar folds two 

 Shell umbilicated 



Surface polished, marked by very fine lines of growth and mic 

 roscopic spiral striations 



Subg. Tiberia Monterosato, 1875. 



Type, Pyramidella nitldula A. Ads. 



Surface polished, marked by fine lines of growth and strong 

 spiral striations 



LJIfa subg. nov. 



Type, Pyramidella (Ulfa) cossmanni nom. 

 nov. = Syrnola striata Cossmann. 



Surface marked by strong axial ribs, intercostal spaces spirally 

 pitted; early post-nuclear whorls sculptured differently from 

 the later ones 



Tropaeas subg. nov. 



Type, Pyramidella subulata A. Ads. 



Shell not umbilicated 



Surface polished, marked by very faint lines of growth and 

 microscopic spiral striations 

 Basal fasciole present 



Vagna subg. nov. 



Type, Pyramidella paumotensis Tryon. 



Basal fasciole absent 



Subg. Eulimella Forbes, 1846. 



Type, Eulimella crassula Fbs., =E. scillw 



Scacchi. 





