Sea slugs are found near shore. Many of them are devoid of shells when adult, but all have shells in their earlier stages.

Sea Slug

Sea slugs are found near shore. Many of them are devoid of shells when adult, but all have shells in…

The Green Sea Slug (Elysia viridis) is a species of a gastropod mollusc in the Placobranchidae family of sea slugs.

Green Sea Slug

The Green Sea Slug (Elysia viridis) is a species of a gastropod mollusc in the Placobranchidae family…

"Limax flavus, a Slug." -Galloway, 1915

Yellow Slug

"Limax flavus, a Slug." -Galloway, 1915

"Snail is the common name of gasteropodous mollusks. They feed chiefly on vegetable substances, though they are very indiscriminate in their appetite and even devour the dead of their own kind. The mischief which they do to garden crops is well known. Snails delight in warm, moist weather; in dry weather, their chief time of activity is during the night, and they hide themselves by day; but after rain they come forth at any hour in quest of food. At the approach of winter or in very dry weather they close the mouth of the shell with a membrane (epiphragm), formed by the drying of the mucous substance which they secrete, and become inactive and torpid."—(Charles Leonard-Stuart, 1911)

Snail

"Snail is the common name of gasteropodous mollusks. They feed chiefly on vegetable substances, though…

"Soft unsegmented bodies, bilaterally symmetrical, enveloped by a leathery mantle, which usually develops a hard shell-covering, or external skeleton; a symmetrical nervous system, consisting of several connected nerve bunches, or ganglia. Such is the snail." — Hinman, 1888

Snail

"Soft unsegmented bodies, bilaterally symmetrical, enveloped by a leathery mantle, which usually develops…

Circulatory and nervous system of a snail. Labels: F, tentacles; Oe, esophagus; Cg, cerebral ganglion; Pg, pedal ganglion and otocyst; Vg, visceral ganglion; Phg, pharyngeal ganglion; A, abdominal aorta; Ac, cephalic aorta; V, veins; V c, brachial veins; Br, gills.

Circulatory and Nervous System of a Snail

Circulatory and nervous system of a snail. Labels: F, tentacles; Oe, esophagus; Cg, cerebral ganglion;…

<em>Helix albolabris</em>, the common garden snail.

Garden Snail

Helix albolabris, the common garden snail.

<em>Lunatia heros</em> or the Northern moon snail, the common salt-water snail of the Atlantic coast.

Northern Moon Snail

Lunatia heros or the Northern moon snail, the common salt-water snail of the Atlantic coast.

The Rosy Wolf Snail (Euglandina rosea) is a predatory snail in the Spiraxidae family of air-breathing land snails and was also known as the synonym Glandina truncata.

Rosy Wolf Snail

The Rosy Wolf Snail (Euglandina rosea) is a predatory snail in the Spiraxidae family of air-breathing…

An illustration of a Spirolina, a sculptured imperfectly coiled shell.

Spirolina

An illustration of a Spirolina, a sculptured imperfectly coiled shell.

"Spirula peronii, lateral view. d, terminal sucker; f, funnel; s1, s2, projecting portions of the shell, the internal part of which is indicated by dotted lines." -Parker, 1900

Spirula Peronii

"Spirula peronii, lateral view. d, terminal sucker; f, funnel; s1, s2, projecting portions of the shell,…

The Atlantic Bobtail (Sepiola atlantica) is a cephalopod in the Sepiolidae family of bobtail squids.

Atlantic Bobtail

The Atlantic Bobtail (Sepiola atlantica) is a cephalopod in the Sepiolidae family of bobtail squids.

A modern decapod cephalopod with remnant of internal shell only.

European Squid

A modern decapod cephalopod with remnant of internal shell only.

"Tellina Balthica&mdash; a common marine shell in the Boulder Clays." -Taylor, 1904

Tellina Balthica

"Tellina Balthica— a common marine shell in the Boulder Clays." -Taylor, 1904

"Tellina crassa." -Taylor, 1904

Tellina crassa

"Tellina crassa." -Taylor, 1904

A variety of invertebrates from the Tertiary age.

Tertiary Invertebrates

A variety of invertebrates from the Tertiary age.

"Trochus ziziphinus." -Taylor, 1904

Trochus ziziphinus

"Trochus ziziphinus." -Taylor, 1904

The wentletrap is a small, white, spiraled gastropod mollusk.

Wentletrap

The wentletrap is a small, white, spiraled gastropod mollusk.

The wentletrap (Scalaria pretiosa) is gastropod mollusk named after its spiral staircase appearance.

Wentletrap

The wentletrap (Scalaria pretiosa) is gastropod mollusk named after its spiral staircase appearance.

The wentletrap (Scalaria pretiosa) is gastropod mollusk named after its spiral staircase appearance.

Wentletrap

The wentletrap (Scalaria pretiosa) is gastropod mollusk named after its spiral staircase appearance.

The common whelk (Buccinum undatum) is a large edible sea snail and a gastropod mollusk.

Common Whelk

The common whelk (Buccinum undatum) is a large edible sea snail and a gastropod mollusk.

"White whelk (Buccinum undatum)." -Taylor, 1904

White Whelk

"White whelk (Buccinum undatum)." -Taylor, 1904