MARGINELLA. VOLVARIA. 



121 



tant chestnut lines^ sometimes forked as they near 

 the lip ; pillar with seven plaits ', lip striated 

 within, f . E. 3/7. 4. 



VOLVARIA. 



Shell cylindrical, convolute ; spire scarcely exserted ; 

 aperture narrow, as long as the shell; colu- 

 mella with one or more folds at its inferior 

 part, 

 V. TRiTiCEA. Ovate-oblong, sub-cylindrical, 



whitish, generally with fulvous zones ; spire rather 



prominent ; lip depressed towards the middle ; 



columella straight, with about four plaits. W. 



19. 54. 



LES ENROULEES. 



OVULA. 



Inflated, attenuated, or acuminated at each end; 

 lips curved inwards ; aperture longitudinal, 

 narrow, effuse at the extremities ; left lip not 

 indented. 



O. oviFORMis. Ovate, inflated, ventricose in 

 the middle, smooth, milk-white; the extremities 

 rather prominent -, sub-truncated ; throat orange ; 

 lip toothed. 3J-. W. 18. 1. 



O. VERRUCOSA. Ovate, gibbous, transversely 



G 



