A DICTIONARY OF TERMS. 



lxi 



Vermiform. Having the shape of worms. The Serpula, are 



vermiform shells. 

 Vertex. - The top, or point of a shell. 

 Viviparous. Shells which are found equally on land and in water. 



The fresh-water Helices are often seen on the 



plants which border the rivers. 



W. 



Waved. - - Some shells are flexuous, bent in and out, or waved. 

 Whirl. - - The same as Spire. 



