114 GLOSSARY. 
V. 
Valvdta, having a valve (i.e. operculum); the name of a 
genus. 
Valvatide. 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. 
viréscens, greenish. 
virgata, striped. 
viridescénti-alba, 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. 
Zellénsis, after a town named Zell. 
Zonites, circular, like a girdle; the name of a genus. 
