Ampithoe valida Smith. A small crustacean found in the intertidal zone hiding under seaweed.
Argopecten irradians (Lamarck). The edible bay scallop is a commercially important commercial bivalve.
Arbacia punctulata (Lamarck). A common sea urchin, relative of sea stars (or starfish).
Busycotypus canaliculata (Linnaeus). The common channeled whelk, a large snail.
Idotea metallica Bosc. Isopod crustaceans such as this species are important food items of fish.
Ilyanassa obsoleta (Say). These common mud snails are often extremely abundant, easily seen at low tide.
Lepidonotus sublevis Verrill. A marine worm or polychaete, easily reconizable by their fleshy overlapping plates.
Leptasterias tenera (Stimpson). A common sea star of deeper waters of New England.
Neptunea decemcostata (Say). Although a deepwater resident, neptune shells are sometimes found washed ashore.
Nucella lapillus (Linnaeus). A predatory snail known as the dogwinkle.
Ophioderma brevispina (Say). The underside of this common brittle star shows exquisite detail.
Palaemonetes pugio Holthuis. One of the common grass shrimps, an important food item of fish.
Psilaster florae (Verrill). Although not common in shallow water, it is very abundant in the deeper waters off New England.
Retilaskeya emersonii (Adams). This small snail has a delicately beaded appearance.
Squilla empusa Say. A large predatory crustacean that lives in burrows, and therefore rarely seen.
Strongylocentrotus drobachiensis (Müller). The green sea urchin is common north of Cape Cod, although occasionally found further south.
Testudinalia testudinalis (Müller). Common tortoise shell limpet.
Urosalpinx cinerea (Say). An oyster drill. Predatory on other shelled mollusks and barnacles.