Columbia subject headings:
Fishes--Sense organs.
Rays (Fishes)--Physiology.
Sharks--Physiology.
Skates (Fishes)--Physiology.
Harvard subject headings:
Fishes--Sense organs.
Rays (Fishes)
Sharks
Skates (Fishes)
Princeton subject headings:
Rays (Fishes)--Physiology.
Sense organs--Fishes.
Sharks--Physiology.
Skates (Fishes)--Physiology.