Pinctada
Unio
Anodonta
Ostrea
Unio
Vila
Mytilus
Loligo
scallop
sea mussel
razor shell
any of these
sea hare
Pond snail
fresh water mussel
chiton
Gastropoda
Caphalopoda
Bivalvia
Scaphopoda
Sepia
Loligo
Patella
Nautilus
Amphineve
Gastropoda
Scaphopoda
Caphalopoda
elephant tusk shells
butterflies of the sea
lerrfons of the sea
cucumbers of the sea
dentalium
cypraea
nautilus
pinctada
pulmonary sac
ctenidia
book lungs
trachea
Gastropoda
Scaphopoda
Bivalva
Cephalopoda
Sepia
Loligo
Octopus
Mytilus
limax and helix
pila and helix
lymnaea and planorbis
none of these
Chiton
Unio
Teredo
Nautilus
Caphalopoda
Gastropoda
Pelecypoda
Scaphopoda
Mikimoto
Katu
Haeckel
Von Mohl
Octopus
Sepia
Mytilus
Teredo
Trochophore
Veliger
Glochidium
Muller's larva
expelling water in a jet through siphon
lashing moment of their cephalic arms
characteristic undulations of their lateral fins
none of these
Gastropoda
Criton
Bivalvia
Monoplacophora
Crab
Aretticola
Milipede
Centipede
external shell of cuttle fish
internal shell of cuttle fish
bones of octopus
calcareous matter of cuttle fish
Pila
Aplysia
Helix
Aphrodite
book lungs
pulmonary sacs
gills
respiratory siphons
Sepia (Caphalopoda)
Uttio (Pelecypoda)
Dentalium (Scaphopoda)
Pila (Gastropoda)
Caphalopods
Scaphopods
Bivalva
Gastropods
a sensory organ for balancing
a sensory organ for smell
swimming organ
none of these
Unio
Mytilus
Teredo
Tridacna
Pila
Starfish
Housefly
Earthworm
an annelid
an arthropod
an echinoderm
a mollusc