EXPLANATION OF THE PLATES 



PLATE L 



a. Spire. 



b. Body whorK 



c. Beak, 

 f/. Base. 

 e. Canal. 



/. Aperture, 



g. Outer lip* 



h. Columellar lip, 



i. Whorls. 



k. Suture, 



. Apex j 



m. Back* 



n. Yarices* 



o. Columella. 



p. Dissepiments, 



q. Umbilicus. 



r. Area or Anterior 



slope. 

 . Areola or Posterior 



slope 



*. Beaks, 

 u. Hinge, 

 v. Ligament, 

 w. Disk. 

 x. Umbo, 

 y. Base. 

 z. Length. 

 a* Breadth. 

 b* Auricles, 

 c* Left valve. 

 d* Right valves 

 * 



