GENUS XXIII. yuLVTA. 109 



Marginella. Shell oval-oblong, smooth; spire short; the 

 right lip with a margin thickened on the ovitside ; the 

 base of the aperture more or less hollowed, with folds on 

 the pillar (see Voliita glabella, f. 73). 



Cancellaria. Shell oval or a little turrited, with the right 

 lip sulcated internally ; the base of the aperture with a 

 slight channel, almost entire ; some folds on the pillar 

 sharp or compressed (see Valuta cancellata, f. 74). 



TuRBiNELLUS. Shell tvu'binated or subfusiform, with a channel 

 at the base ; the pillar with three to five compressed 

 transverse folds (see Valuta Pyrum, f. 75). 



Auricula. Shell oval or oblong ; spire protruded ; the aper- 

 ture entire, longer than wide, narrowed upwards ; pillar 

 with one or more folds (see /. 76). 



