SHELLS . 51 



called varices, from the Latin varix, a swollen 

 vein. But such parts as occur only in a few 

 species we will notice when we examine the 

 species. You must now repeat to me the parts 

 of a univalve shell, and I will write them on the 

 slate. 



PARTS OF A UNIVALVE SHELL. 



The spire, 

 whorls, 

 body whorl, 

 first whorl, 

 suture, 

 apex, 

 base, 

 aperture, 

 lips. 



columellar lip. 

 outer lip. 

 columella. 

 body, 

 back, 

 front, 

 right side, 

 left side, 

 operculum. 



Teacher. Describe to me each part and its 

 position. 



Child. The spire is composed of the upper 



