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"Male of Balanoglossus (Dolichoglossus) kowalevskii. Note anterior proboscis. Mo., Mouth; op., slight operculum behind the collar; then the region with gill-slits; ts., testes; a., anus." -Thomson, 1916

Balanoglossus

"Male of Balanoglossus (Dolichoglossus) kowalevskii. Note anterior proboscis. Mo., Mouth; op., slight…

An illlustration of a dasychone infracta, a type of annelid. The annelids, collectively called Annelida (from Latin anellus "little ring"), are a large phylum of animals comprising the segmented worms, with about 15,000 modern species including the well-known earthworms and leeches.

Dasychone Infracta

An illlustration of a dasychone infracta, a type of annelid. The annelids, collectively called Annelida…

Euchone elegans is a species of marine worms in the family, Terebellidae, sometimes known as spaghetti worms.

Euchone

Euchone elegans is a species of marine worms in the family, Terebellidae, sometimes known as spaghetti…

Echinoderes dujardini is a worm-like creature in the Kinorhyncha phylum of mud dragons.

Kinorhynch

Echinoderes dujardini is a worm-like creature in the Kinorhyncha phylum of mud dragons.

An illustration of the marine worm larva, Lopadorhymchus.

Lopadorhymchus

An illustration of the marine worm larva, Lopadorhymchus.

A diagram of of the nephridium of Nereis. Nereis is a genus of polychaete worms in the family Nereidae. It comprises many species, most of which are marine, including the sandworm (Nereis virens) and the common clam worm (Nereis succinea). Nereis possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor chaetae are for crawling, and are the bristles that are visible on the exterior of the polchaeta.

Nereis

A diagram of of the nephridium of Nereis. Nereis is a genus of polychaete worms in the family Nereidae.…

<i>Sipunculus nudus</i>. A species of unsegmented marine worm, commonly called the peanut worm. "A, One fourth natural size, in longitudinal section. T, tentacles; r,r,r,r, four retractor muscles of the proboscis, detached from the points r1, r1 in the body walls; a, anus; ae, esophagus; i, intestine with j1, j2 its loops; x, y, appendages of rectum; z, fusiform mscle; w, ciliated groove of intestine; q, anal muscles; s, caecal glands of t, caeca, the so-called testes; p, pore at end of body; n, nervous cord, ending in a lobed ganglionic mass near the mouth, with an enlargement, g1, posteriorly; m1, m2, muscles associated with the nervous cord." &mdash;Whitney, 1889

Peanut Worm - Interior Anatomy of Adult

Sipunculus nudus. A species of unsegmented marine worm, commonly called the peanut worm. "A, One fourth…

<i>Sipunculus nudus</i>. A species of unsegmented marine worm, commonly called the peanut worm. "B, Larval Sipunculus, about one twelfth of an inch long. o, mouth; oe, esophagus; s, caecal gland; i1, intestine with masses of fatty cells; a, anus; w, ciliated groove of intestine; g, brain with two pairs of red eye-spots; n, nervous cord; p, pore; t, t1, so-called testes; W, W, circlet of cilia." &mdash;Whitney, 1889

Peanut Worm - Interior Anatomy of Larva

Sipunculus nudus. A species of unsegmented marine worm, commonly called the peanut worm. "B, Larval…

"Phoronis...TR., Trunk; TE., tentacles; TU., tube." -Thomson, 1916

Phoronis

"Phoronis...TR., Trunk; TE., tentacles; TU., tube." -Thomson, 1916

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

Polychaete

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

A marine worm at breeding season.

Marine Worm

A marine worm at breeding season.

A marine worm.

Marine Worm

A marine worm.

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along the sides of the body. These are Polychaetes or "many-bristle") worms, Nereis being one and a common form along the seashore. The body presents the same segmented apprerance as the earthworm. The head is provided with numerous sense organs, among which are four eyes and several tentacles or feelers. This figure the marine worm appearance at breeding season.

Marine Worm

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along…

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along the sides of the body. These are Polychaetes or "many-bristle") worms, Nereis being one and a common form along the seashore. The body presents the same segmented apprerance as the earthworm. The head is provided with numerous sense organs, among which are four eyes and several tentacles or feelers. A marine worm during normal seasons.

Marine Worm

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along…

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along the sides of the body. These are Polychaetes or "many-bristle") worms, Nereis being one and a common form along the seashore. The body presents the same segmented apprerance as the earthworm. The head is provided with numerous sense organs, among which are four eyes and several tentacles or feelers. A head of a marine worm is shown.

Marine Worm

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along…

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along the sides of the body. These are Polychaetes or "many-bristle") worms, Nereis being one and a common form along the seashore. The body presents the same segmented apprerance as the earthworm. The head is provided with numerous sense organs, among which are four eyes and several tentacles or feelers. The lateral appendage of a marine worm is shown.

Marine Worm

Marine worms, also known as Nereis, a worm with highly developed heads and many bristles arranged along…

Marine worms (Polynoe bevisetosa), a worm with highly developed heads and many bristles arranged along the sides of the body. These are common form along the seashore. The body presents the same segmented apprerance as the earthworm. The head is provided with numerous sense organs, among which are four eyes and several tentacles or feelers. Shown is a common marine worm with extended proboscis and overlapping plated covering the back.

Marine Worm

Marine worms (Polynoe bevisetosa), a worm with highly developed heads and many bristles arranged along…