Sand gaper
Sand goby
Sand mason
Sand star
Sand-smelt
Sandhopper
Scampi
Sea belt
Sea cypres
Sea gooseberry
Sea lemon
Sea lettuce
Sea oak
Sea scorpion
Sea-grape
Sea-mouse
Sea-potato
Sea-slater
Sea-snail
Seahorse
Seals, sea lions and walruses
Seaweed shrimp
Shore sea urchin
Slender eolis
Slipper limpet
Sloke
Small comb-star
Small snakelocks anemone
Snake pipefish
Sole
Solenette
Spiny comb-star
Spiral wrack
Sponges
Star squirt
Sugar kelp