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Bivalves are mollusks with two shells.

Abalone Jingle

Pododesmus cepio

(1-4: San Carlos Beach, Monterey / 5-6: Monterey State Beach, Monterey)

These are jingles, not abalones, despite the name.  They stick flush against rocks, even conforming to the shape of the rock if it's not flat.

Bay Mussel

Mytilus trossulus

(1: San Carlos Beach, Monterey / 2-3: Lovers Point, Monterey)

Lacks the radiating ridges of the California mussel (Mytilus californianus).

California Sunsetclam

Gari californica

(1: Whaler's Cove, Point Lobos)

These live under gravel, so normally you just find the shells.

Geoduck Clam

Panope generosa

(1: Monterey State Beach, Monterey / 2-7: San Carlos Beach, Monterey)

Giant Pacific Scallop

(aka Weathervane Scallop)

Patinopecten caurinus

(1: San Carlos Beach, Monterey)

Heart Cockle

Clinocardium nuttallii

(1: Monterey State Beach, Monterey / 2: Whaler's Cove, Point Lobos)

Mediterranean Mussel

Mytilus galloprovincialis

(1: Bluefish Cove, Point Lobos)

Rock Scallop

Crassedoma gigantea

(1: Monterey State Beach, Monterey / 2,6-8: San Carlos Beach, Monterey / 3-4: Sutil Island, Santa Barbara Island / 5: Flame Reef, Santa Cruz Island)

Scallops have lots of eyes:
(1: San Carlos Beach, Monterey)

Commonly covered in yellow sponge.

Scaleside Piddock

Parapholas californica

(1-2: Whaler's Cove, Point Lobos)

Sea-Bottle Clam

Mytilimeria nuttallii

(1: Monastery Beach, Carmel-by-the-Sea)

Spiny Pricklycockle

Dallocardia quadragenaria

(1: Monterey State Beach, Monterey)

Spiny Scallop

Chlamys hastata

(1,3: San Carlos Beach, Monterey / 2: Whaler's Cove, Point Lobos)

Also frequently covered in yellow sponge.

Wart-Neck Piddock

Chaceia ovoidea

(1: Monterey State Beach, Monterey / 2: Ship Rock, Santa Catalina Island)