Moon jelly (Amelia aurita)
Moon snail (Polinices duplicatus or Lunatia heros)
Mount Desert Island
Murlin (Alaria esculenta)
Mussel, common or blue (Mytilus edulis); enemies of; habitat and life cycle; and Sertularians
Mussel, date (Lithophaga bisulcata)
Mussel, horse (Volsella modiolus)
Mya arenaria
Myrtle Beach
Mytilus edulis (see Mussel, common or blue)
Nautilus, paper (Argonauta argo)
Needlefish (Tylosura raphidoma)
Nemerteans
Nereid worms
Nereis virens
Nerite (Nerita peloronta or Nerita versicolor)
Noetia ponderosa
Nomeus gronovii
Oarweeds
Octopus (Octopus vulgaris)
Ocypode albicans
Old man’s beard (Usnea barbata)
Onchidium floridanum
Oölitic limestone
Opercula
Ophiocoma echinata
Ophiopholis aculeata
Oreaster reticulatus
Ostracods
Ostrea frons
Oysters; larval; mangrove (Ostrea frons); pearl (Pteria colymbus)
Palolo worm, Atlantic (Eunice fucata)
Panulirus argus
Parchment worm (Chaetopterus variopedatus)
Pearl fish (Fierasfer bermudaensis)
Pen shell (Atrina rigida or Atrina serrata)
Periwinkle, beaded (Tectarius muricatus); common (Littorina littorea); European rock (Littorina neritoides); mangrove (Littorina angulifera); rough or rock (Littorina saxatilis); smooth (Littorina obtusata)
Petaloconchus
Phaeophyceae
Pholis gunnellus
Physalia pelagica
Piddock, wood (Martesia cuneiformis)
Pinnixa chaetopterana
Pipefish (Syngnathus sp.)
Platyhelminths
Pleurobrachia pileus
Pleuroploca gigantea
Pliny
Plumed worm (Diopatra cupraea)
Polinices duplicatus
Polysiphonia lanosa
Ponderous ark (Noetia ponderosa)
Porphyra umbilicalis
Portuguese man-of-war (Physalia pelagica)
Pourtalès Plateau
Protophytes
Protozoans
Purple sail (Veletta mutica)
Purpurin
Radula, dog whelk; limpet; periwinkle
Ralfsia verrucosa
Ramshorn shell (Spirula spirula)
Red tides
Redi
Renilla reniformis
Rhizophora mangle
Rhodymenia palmata
Ribbon worms
Rock tripe (Umbilicaria sp.)
Rocks as records of history
Rockweed (see Wrack)
Rocky shores, life of
Sand, fauna of; types of
Sand anemone (Cerianthus americanus)
Sand dollar (Mellita testudinata)
Sand hopper (see Beach flea)
Sangamon interglacial period
Sanibel Island
Scale worm (Lepidonotus squamatus)
Scaphanders
Screwshell snail (Terebra)
Scyphozoans
Sea anemone, arctic; plumose (Metridium dianthus)
Sea birds, (see also Gulls)
Sea biscuit (Clypeaster subdepressus)
Sea bottle (Valonia macrophysa)
Sea colander (Agarum turneri)
Sea cucumber; northern (Cucumaria frondosa); West Indian (Actinopyga agassizi)
Sea fan (Gorgonia flabellum)
Sea finger (Alcyonium digitatum)
Sea grape (Molgula manhattensis)
Sea grasses; inhabitants of
Sea hare (Aplysia dactylomela)
Sea horse (Hippocampus hudsonius)
Sea lace (Membranipora pilosa); (Microporella ciliata)
Sea mat (Flustrella hispida)
Sea moss (see Irish moss)
Sea mouse (Aphrodite aculeata)
Sea pansy (Renilla reniformis)
Sea pens
Sea pork (Amaroucium sp.)
Sea potato (Leathesia difformis)
Sea roach (Ligia exotica)
Sea spider
Sea squirts
Sea star (Oreaster reticulatus)
Sea tangle (Laminaria saccharina)
Sea turtles, green (Chelonia my das); hawksbill (Erectmochelys imbricata); loggerhead (Caretta caretta)
Sea urchins; green (Strongylocentrotus droebachiensis); heart (Moira atropos); keyhole (Mellita testudinata); long-spined (Diadema antillarum); rock-boring (Echinometra lucunter); slate-pencil (Eucidaris tri-buloides)
Sea vase (Ciona intestinalis)
Sea whip (see Gorgonians)
Seaweeds, exposed coast; sheltered coast, (see also Irish moss and Wrack)
Seed plants
Sertularia pumila
Shackleford Shoals
Shipworm (Teredo navalis)
Shoals, fauna of
Shrimp; ghost (Callianassa stimpsoni); mantis (Squilla empusa); snapping (Synalpheus brooksi)
Siphonophores
Skates
Slipper shell (Crepidula fornicata)
Snail, banded tulip shell (Fasciolaria hunteria); flamingo-tongue (Cyphoma gibbosum); moon or sand collar (Polinices duplicatus or Lunatia heros); nerite (Nerita peloranta or Nerita versicolor); screwshell (Terebra); vermetid (Petaloconchus); violet (Janthina janthina), (see also Periwinkle and Whelk)
Snellius
Soft coral (Alcyonium digitatum)
Sphaerella
Spheciospongia vesparia
Spirorbis borealis
Spirula spirula
Sponge; crumb-of-bread (Halichondria panicea); Leucosolenia botryoides; loggerhead (Spheciospongia vesparia); sulphur (Cliona celata)
Squids
Squilla empusa
Starfish; blood-red (Henricia sanguinolenta); common (Asterias forbesi); giant (Oreaster reticulatus); Linkia guildingii; Luidea clathrata; northern (Asterias vulgaris)