2
animal
background
bivalve
bivalvia
bright
calcareous
calcium
case
chitin
clam
close
coating
concave
couple
cream
creamy
empty
exeskeleton
gastropod
hard
hollow
isolated
ivory
layer
light
marine
mollusc
molluscan
mollusk
molusc
mussel
nacreous
nacrous
object
ocean
outer
pair
pearl
protective
scallop
sea
seashell
shell
shelter
snail
spiral
two
white
whole