102 COLUMBELLID^E. 



Synopsis of Genent. 



COLUMBELLA, Lam. Shell Strombiform, fusiform or obovate ; smooth 

 or longitudinally or transversely ribbed or striate ; inner lip excavated 

 in the middle, crenulated or denticulated in front ; outer lip usually 

 inflected, thickened within and crenulated in the middle. 



COLUMBELLA (restricted). Shell Strombiform, with short spire. Den- 

 tition, PI. 2, fig. 18. 



NITIDELLA, Swainson. Shell ovat> smooth, with elevated spire ; 

 aperture somewhat effuse below ; columella with two small anterior 

 plications ; outer lip somewhat thickened. 



ALIA, H. and A. Adams. Shell thin, smooth, with moderate spire ; 

 aperture oval ; inner lip finely crenulated, outer lip thick, not callous 

 in the middle, striate within. 



MITRELLA, Risso. Shell Mitriform, smooth, with moderate spire ; 

 columella smooth or with a few anterior rugosities ; outer lip smooth 

 or crenulated within. 



ATILIA, H. and A. Adams. Shell fusiform, smooth or longitudinally 

 plicate ; spire elevated, sharp ; last whorl suddenly narrowed into a 

 beak or short canal in front. 



ANACHIS, H. and A. Adams. Shell oval-fusiform, longitudinally 

 ribbed, spire elevated ; last whorl not narrowed in front ; aperture 

 narrow ; collumella straight ; outer lip nearly straight, crenulated 

 within. Dentition, PI. 2, fig. 20. 



SEMINELLA, Pease. Shell very small, fusiform, longitudinally costate, 

 usually decussated ; lip slightly emarginate above, lirate or denticulate 

 within. 



MITROPSIS, Pease. Shell fusiform, more or less costate or plicate 

 longitudinally ; aperture narrow ; lip dentate within, sinuated above ; 

 columella callous, plicate. 



Perhaps not distinct from Seminella. 



CONIPEA, Swainson. Shell oval, Mitriform, smooth, with moderately 

 elevated, convex spire ; inner lip reflected in front ; outer lip incurved 

 and thickened in the middle, and crenulated within. 



META, Reeve. Shell coniform, with short, conic spire ; aperture 

 narrow ; outer lip nearly straight, crenulated within. 



STROMBINA, Morch. Shell fusiform, turriculated ; spire elevated, 

 sharp ; whorls gibbous, nodulous ; inner lip with a rather thick callus ; 

 outer lip thick, sinuous behind ; anterior canal well formed. Dentition, 

 PI. 2, fig. 19. 



^Esopus, Gould. Shell fusiform, gibbous, broadly truncate in front ; 

 aperture lunate, with a posterior callus on the body ; columella smooth, 

 vitreous ; suture abnormally arcuate near the aperture. 



