114 GLOSSARY. 



F. 



Valvdta, having a valve (i.e. operculum) ; the name of a 



genus. 



Valvatidce. A Family of mollusks. 

 valve, a complete part of a shell. 

 variety. Varieties are members of a species that deviate 



constantly from the type in form, size, or colour. 

 ventricosa, full-bellied, swollen. 

 ventrosa, swollen. 



Vertigo, a twisting ; the name of a genus. 

 virescens, greenish. 

 virgdta, striped. 



viridescenti-dlba, greenish white. 

 viridula, somewhat green. 

 vitrea, glassy. 



vitrina, transparent like glass. 

 vivipara, producing young alive. 

 vortex, a whirlpool. 



W. 



whorl, a twist of a spiral shell. 



Z. 



ZelUnsis, after a town named Zell. 



ZoniteSj circular, like a girdle ; the name of a genus. 



