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The shell of Fasciolario buccinoides, a species of gastropod.

Fasciolario Gastropod

The shell of Fasciolario buccinoides, a species of gastropod.

A mollusk radiate from the Paleozoic time, Cyclonema cancellata from the Clinton group.

Cyclonema Mollusk

A mollusk radiate from the Paleozoic time, Cyclonema cancellata from the Clinton group.

A mollusk radiate from the Paleozoic time, Platyceras angulatum from the Niagara group.

Platyceras Mollusk

A mollusk radiate from the Paleozoic time, Platyceras angulatum from the Niagara group.

An ancient mollusk from the Paleozoic time, Goniatites Marcellensis from the Hamilton group.

Goniatites Mollusk

An ancient mollusk from the Paleozoic time, Goniatites Marcellensis from the Hamilton group.

"Forms of spermatozoa (not drawn to scale). 1 and 2. Immature and mature spermatozoa of snail; 3. of bird; 4. of man (h., head; m., middle portion; t., tail); 5. of salamander, with vibratile fringe (f.); 6. of Ascaris, slightly amoeboid with cap (c); 7. of crayfish." -Thomson, 1916

Spermatozoa

"Forms of spermatozoa (not drawn to scale). 1 and 2. Immature and mature spermatozoa of snail; 3. of…

"Colony of Hydractinia on back of a Buccinum shell tenanted by a hermit-crab." -Thomson, 1916

Hydractinia

"Colony of Hydractinia on back of a Buccinum shell tenanted by a hermit-crab." -Thomson, 1916

"Diagram of life cycle of liver fluke." -Thomson, 1916

Liver Fluke Life Cycle

"Diagram of life cycle of liver fluke." -Thomson, 1916

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including anus and opening of ureter); f., the foot; g.ap., genital aperture; m., mouth; e., eye on long horn; s.h., one of short horns." -Thomson, 1916

Roman Snail

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including…

"Vertical section of the shell of a species of Helix. M., Mouth of shell; A., apex; C., columella." -Thomson, 1916

Shell

"Vertical section of the shell of a species of Helix. M., Mouth of shell; A., apex; C., columella."…

"Dissection of snail. T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., salivary glands on the crop; F., foot; M., columellar muscle; V.C., visceral coil; O.T., ovotestis; V., ventricle of heart; R. rectum; U., ureter; B.V., blood vessels returning to the auricle from the mantle; A., pulmonary aperture; MA., edge of the mantle." -Thomson, 1916

Dissection

"Dissection of snail. T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., salivary…

"Reproductive organs of Helix pomatia. O.T., Ovotestis; H.D., hermaphrodite duct; A.G., albumen gland; F.D., female side of common duct; M.D., male side of common duct; O., oviduct; R.S., receptaculum seminis; M.G., mucus glands; D.S., dart-sac; V.D., vas deferens; FL., flagellum; P., penis; M., retractor muscle of penis; AP., genital aperture." -Thomson, 1916

Snail Reproductive Organs

"Reproductive organs of Helix pomatia. O.T., Ovotestis; H.D., hermaphrodite duct; A.G., albumen gland;…

"Snail (Helix pomatia) laying its eggs." -Thomson, 1916

Roman Snail Eggs

"Snail (Helix pomatia) laying its eggs." -Thomson, 1916

"Helix. A, an empty shell in section from apex to base...a, apex of shell; ap., aperture of shell; c, columella or axis of shell; l, lip of shell; s, suture, between whorls." -Galloway, 1915

Helix Shell

"Helix. A, an empty shell in section from apex to base...a, apex of shell; ap., aperture of shell; c,…

"Helix. B, the relation of the animal to the shell when extended...a, apex of shell; an., anus; e, eyestalk; f, foot; l, lip of shell; m, edge of mantle, which secretes the shell; r.a., respiratory aperture; t, tentacles." -Galloway, 1915

Helix Snail

"Helix. B, the relation of the animal to the shell when extended...a, apex of shell; an., anus; e, eyestalk;…

"Helix albolabris, a pulmonate Gasteropod." -Galloway, 1915

Helix Albolabris

"Helix albolabris, a pulmonate Gasteropod." -Galloway, 1915

"Helix nemoralis. an, anus; gen. ap, genital aperture; oc. tent. posterior eye-bearing tentacles; pulm, opening of pulmonary sac; tent, anterior tentacles." -Parker, 1900

Snail Parts

"Helix nemoralis. an, anus; gen. ap, genital aperture; oc. tent. posterior eye-bearing tentacles; pulm,…

"Cypraea moneta (Cowrie). Showing the mantle, provided with marginal tentacles, partly enveloping the shell. Br, branchia; M, M, mantle; F, foot; T, tentacles at the edge of the mantle." -Parker, 1900

Money Cowry

"Cypraea moneta (Cowrie). Showing the mantle, provided with marginal tentacles, partly enveloping the…

"Trochus ziziphinus." -Taylor, 1904

Trochus ziziphinus

"Trochus ziziphinus." -Taylor, 1904

"Cyprea Europea." -Taylor, 1904

Cyprea Europea

"Cyprea Europea." -Taylor, 1904

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

White Whelk

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

A species of snail with a round mouth (1).

A Species of Snail

A species of snail with a round mouth (1).

In high orders of Mollusca the circulation resembles that of fish. Shown is the heart and arteries of a snail. Labels: 2, The stomach. 3, Intestines. 5, Heart. 6, Aorta. 7, Pulmonary artery.

The Heart and Arteries of a Snail

In high orders of Mollusca the circulation resembles that of fish. Shown is the heart and arteries of…

A thin diaphanous shell in which species of the genus Limnaea live. They can be found in the fresh waters of most countries.

Limnaea Stagnalis (Linnaeus)

A thin diaphanous shell in which species of the genus Limnaea live. They can be found in the fresh waters…

The shell of the Planorbis is thin, light and disk-like in form. The can creep along solid bodies, or swim upside-down through the water.

Planorbis Corneus (Linnaeus)

The shell of the Planorbis is thin, light and disk-like in form. The can creep along solid bodies, or…

"The snails are male and female in the same individual, or hermaphrodite. The Romans had many species served up at their feasts, which they distinguished in categories according to the delicacy of their flesh."

Helix Aspersa (Var. Scalaris)

"The snails are male and female in the same individual, or hermaphrodite. The Romans had many species…

"The snails are male and female in the same individual, or hermaphrodite. [This is] the favorite culinary snail in the region around Paris"

Helix Pomatia (Linnaeus)

"The snails are male and female in the same individual, or hermaphrodite. [This is] the favorite culinary…

Tun-bottomed classification of the genus <em>Helix</em>.

Helix Undulata (Ferussac)

Tun-bottomed classification of the genus Helix.

Plain or biform classification of the genus <em>Helix</em>.

Helix Translucida (Linnaeus)

Plain or biform classification of the genus Helix.

Plain or biform classification of the genus <em>Helix</em>.

Helix Waltoni (Reeve)

Plain or biform classification of the genus Helix.

An "idea of the many elegant forms which the shell of the genus <em>Helix</em> assumes."

Helix Citrina

An "idea of the many elegant forms which the shell of the genus Helix assumes."

An "idea of the many elegant forms which the shell of the genus <em>Helix</em> assumes."

Helix Stuartia

An "idea of the many elegant forms which the shell of the genus Helix assumes."

Kindred of the genus <em>Helix</em>.

Pupa Uva

Kindred of the genus Helix.

Found "amid the grasses and in shrubs near brooks."

Succinea Putris (Linnaeus)

Found "amid the grasses and in shrubs near brooks."

This shell is so small that the animal cannot enter it.

Vitrina Fasciata (Ed. and Soul)

This shell is so small that the animal cannot enter it.

"Ruby-eyed Limpet, from the Antilles. If the common Limpet is alarmed, no human force, pulling in a direct line, can remove it."

Patella Granatina (Linnaeus)

"Ruby-eyed Limpet, from the Antilles. If the common Limpet is alarmed, no human force, pulling in a…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Trochus Niloticus (Linnaeus)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Trochus Virgatus (Gmel.)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Trochus Inermis (Gmel.)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Trochus Cookii (Chemnitz)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Trochus Imbricatus Gmel.)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"The species of the genus <em>Trochus</em> are found in all seas, and near to the shore in the clefts of rocks, especially in places where seaweeds grow luxuriantly."

Phorus Conchyliophorus (Borfu)

"The species of the genus Trochus are found in all seas, and near to the shore in the clefts…

"A large thick and weighty shell, round-bellied and deeply furrowed; it is yellow, or rust-colored, marked my square, brown spots."

Turbo Margaritaceus (Linnaeus)

"A large thick and weighty shell, round-bellied and deeply furrowed; it is yellow, or rust-colored,…

"The Marbled Turbo is the largest shell in the group. It is marbled green, white and brown outside, and superbly nacred inside."

Turbo Marmoratus (Linnaeus)

"The Marbled Turbo is the largest shell in the group. It is marbled green, white and brown outside,…

"The Wavy Turbo is commonly known as the Australian Serpent's-skin."

Turbo Undulatus (Chemnitz)

"The Wavy Turbo is commonly known as the Australian Serpent's-skin."

This specimen comes from the Chinese seas. It is green on the outside, and brilliantly nacred within.

Turbo Imperialis (Gmel.)

This specimen comes from the Chinese seas. It is green on the outside, and brilliantly nacred within.

"The <em>Monodonta</em> are elegantly marked shells. Some curious specimens from this family come from the Indian ocean; they are remarkable for their numerous spines and the asperity of their shells."

Delphinula Sphaerula (Kiener)

"The Monodonta are elegantly marked shells. Some curious specimens from this family come from…

"The <em>Monodonta</em> are elegantly marked shells. Some curious specimens from this family come from the Indian ocean; they are remarkable for their numerous spines and the asperity of their shells. The Spurred Trochus, studded with radiating spines."

Imperator Stella (Lamarck)

"The Monodonta are elegantly marked shells. Some curious specimens from this family come from…

"The <em>Monodonta</em> are elegantly marked shells. Some curious specimens from this family come from the Indian ocean; they are remarkable for their numerous spines and the asperity of their shells. The Star Commander, a native of the Australian seas."

Imperator Stellaris (Lamarck)

"The Monodonta are elegantly marked shells. Some curious specimens from this family come from…

"The Staircase-shell is recognized by its deep umbilicus, wide and funnel-shaped, in the interior of which may be seen the little teeth which follow the edge of every turn of the spiral up to the top. The diameter of this shell is sometimes two and a half inches."

Solarium Perpectivum (Bottom View)

"The Staircase-shell is recognized by its deep umbilicus, wide and funnel-shaped, in the interior of…

"The Staircase-shell is recognized by its deep umbilicus, wide and funnel-shaped, in the interior of which may be seen the little teeth which follow the edge of every turn of the spiral up to the top. The diameter of this shell is sometimes two and a half inches."

Solarium Perpectivum (Side View)

"The Staircase-shell is recognized by its deep umbilicus, wide and funnel-shaped, in the interior of…

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp point, some of them having fluted spirals, others rounded, angular or flat."

Turritella Replicata (Linnaeus)

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp…

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp point, some of them having fluted spirals, others rounded, angular or flat."

Turritella Angulata (Sowerby)

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp…

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp point, some of them having fluted spirals, others rounded, angular or flat."

Turritella Sanguinea (Reeve)

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp…

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp point, some of them having fluted spirals, others rounded, angular or flat."

Turritella Goniostoma

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp…

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp point, some of them having fluted spirals, others rounded, angular or flat."

Turritella Terebellata (Lamarck)

"Some other species, the names of which indicate a winding pyramid, have shells terminating in a sharp…

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths of rivers, but rarely beyond the point to which the tide reaches."

Cerithium Fasciatum (Brug.)

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths…

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths of rivers, but rarely beyond the point to which the tide reaches."

Cerithium Aluco.

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths…

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths of rivers, but rarely beyond the point to which the tide reaches." This figure is known as the Giant Cerithium.

Cerithium Giganteum (Lamarck)

"There are some species which are chiefly found in the muddy bottoms, and more frequently at the mouths…

"The Cowries are found at a little distance from the shore, generally in clefts of the rocky bottoms; sometimes they bury themselves in the sand. These magnificent mollusks are natives or every sea."

Cypraea Argus (Linn.)

"The Cowries are found at a little distance from the shore, generally in clefts of the rocky bottoms;…

"The animal which inhabits these shells is elongated, and is provided with a well-developed mantle, furnished on the inside with a band of tentacular filaments; it is able to fold itself over its shell in such a manner as to envelop it all around."

Cypraea Tigris (Linnaeus)

"The animal which inhabits these shells is elongated, and is provided with a well-developed mantle,…