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"Having a sinuous pallial margin and consequent sinuous impression on the shell along the line of attachment of the mantle. Into the sinus thus formed the siphons, which are always developed in these bivalves, can more or less be withdrawn." —Whitney, 1889

Iphigenia Brasiliensis - Sinupalliate Right Valve

"Having a sinuous pallial margin and consequent sinuous impression on the shell along the line of attachment…

"Bivalves are those mollusks whose coverings consist of two concave shelly plates or valves united by a hinge."—(Charles Leonard-Stuart, 1911)

Bivalve

"Bivalves are those mollusks whose coverings consist of two concave shelly plates or valves united by…

Shell of a bivalve, those mollusks whose coverings consist of two concave shelly plates or valves.

Bivalve

Shell of a bivalve, those mollusks whose coverings consist of two concave shelly plates or valves.

"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior adductor muscle; ad.p., posterior adductor muscle; h, hinge with teeth; l, attachments of the ligaments; p, pallial line, marking the attachment of the mantle muscles; s, the pallial sinus, marking the attachment of the retractor muscles of the siphon; u, umbo or beak." — Galloway

Bivalve Mollusk

"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior…

"Mya arenaria, a burrowing clam. The siphon is represented as fully extended. This is quickly retracted when the animal is disturbed." -Galloway, 1915

Burrowing Clam

"Mya arenaria, a burrowing clam. The siphon is represented as fully extended. This is quickly retracted…

Galatea reclusa is a species of bivalve mollusk in the Donacidae family of bean clams (wedge shells).

Right Valve of Galatea Bivalve

Galatea reclusa is a species of bivalve mollusk in the Donacidae family of bean clams (wedge shells).

"Dorsal View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney, 1911

Dorsal View of Gastrochaena

"Dorsal View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney,…

"Lateral View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney, 1911

Lateral View of Gastrochaena

"Lateral View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney,…

"Ventral View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney, 1911

Ventral View of Gastrochaena

"Ventral View of Gastrochaena. The ventral view shows the dried mantle with pedal perforation." -Whitney,…

"Gnathodon cuneatus. A bivalve mollusk. G. cuneatus is the cuneate clam of Louisiana." -Whitney, 1911

Gnathodon

"Gnathodon cuneatus. A bivalve mollusk. G. cuneatus is the cuneate clam of Louisiana." -Whitney, 1911

pond mussel dissected to show alimentary canal, al c..

Mussel

pond mussel dissected to show alimentary canal, al c..

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion indicated; c, gills; d, mouth; e, tentacles or palps; f, posterior adductor muscle; g, anterior adductor; h, head-ganglion; i, ventricle of heart; j, auricle of heart; k, rectum; l, kidney; m, exhalent aperture; n, inhalent aperture." -Vaughan, 1906

Mussel Anatomy

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion…

"Mya arenaria, in living position." -Taylor, 1904

Mya arenaria

"Mya arenaria, in living position." -Taylor, 1904

"Mya truncata, in living position." -Taylor, 1904

Mya truncata

"Mya truncata, in living position." -Taylor, 1904

The scallop (Hinnites pusio) is a marine bivalve mollusk from the Pectinidae family.

Scallop

The scallop (Hinnites pusio) is a marine bivalve mollusk from the Pectinidae family.

The Shipworm (Teredo navalis) is a saltwater clam that is known for boring into wooden structures such as ships, piers, and docks.

Shipworm

The Shipworm (Teredo navalis) is a saltwater clam that is known for boring into wooden structures such…