habits, [114];

land forms, [101], [117];

locomotion, [114], [115];

nervous system, [105], [106];

parasitic forms, [101], [119];

pelagic forms, [101], [114];

proboscis, [100], [101] f., [103], [104], [110], [115];

regeneration, [115];

sense organs, [101], [106], [107];

size, [100]