OF CONCHOLOGY. 29 



but, as it is situated in the interior of 

 the shell, a minute description is un- 

 necessary. Plate 2nd, figures 10th 

 and 12th, 31 M 31 31 31; and plate 

 3d, fiV. 9th, 31 31 31. 



Pillar Lip is a continuation of the 

 glossy process with which the aper- 

 ture is lined, expanded on the colu- 

 mella. Plate 3d, figures 7th and 8th, 

 oo. 



Outer Lip. The expansion, or 

 continuation of the body of the shell, 

 on the left margin of the aperture, 

 and is also lined with the glossy pro- 

 cess of the aperture. Plate 2nd, fig. 

 7th, N; and plate 3d, fig. 8th, NNN. 

 The latter is an example of the alated 

 or winged shells. 



Plaited Columella are those folds, 

 or plaits, which are the distinguishing 

 characteristic of the Voluta genus. 

 Plate 2nd, fig. 7th, *. 



Operculum, or lid. This is only an 

 appendage to the turbinated or spiral 



