giant african snail in the laboratory.

african air anus apex blood breathing cavity cerebral coelom columella concentric cord cosmetic digestive dioecious esophagus food ganglia geophia giant gill gland hemocoel hemocyanin icon intestine keel kidney laboratory land lung macro mantle mollusc mouth mucus muscle nephridium nerve osphradium ovaries oviduct pericardial pericardium peristome radula rectum serum shell sinus slime slug snail snails species spiral spire structure testes umbilicus whorl