SHELLS. 51 



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 OP 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 ride. 



operculum. 



Teacher. Describe to me each part and its 

 position. 



Child. The spire is composed of whorls, and 

 is situated at the upper part of the shell. 



The whorls are the parts that roll round and 

 orm the spire. 



E 2 



