Nervous system of a flatworm. Labels: G, cerebral ganglia and eyes; St, the two lateral nerve trunks; D, intestine with mouth.

Nervous System of the Flatworm

Nervous system of a flatworm. Labels: G, cerebral ganglia and eyes; St, the two lateral nerve trunks;…

"Elytrum of Polymoë, a polychaetous annelid, bearing fimbriae, viewed from above." -Whitney, 1911

Polymoë

"Elytrum of Polymoë, a polychaetous annelid, bearing fimbriae, viewed from above." -Whitney, 1911

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus of a tapeworm; R, edge of body; c, collecting tubules. B, terminal cells with flame of cilia. C, diagram of terminal cell, excretory capillary, and canal.

Protonephridium

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus…

Structure of the protonephridium (excretory organ) of a shark. Labels: Wtr, ciliated funnels; Ug, segmental duct.

Protonephridium of a Shark

Structure of the protonephridium (excretory organ) of a shark. Labels: Wtr, ciliated funnels; Ug, segmental…

Structure of the protonephridium (excretory organ) of an annelid. Labels: Wtr, ciliated funnels; Ds, dissepiments.

Protonephridium of an Annelid

Structure of the protonephridium (excretory organ) of an annelid. Labels: Wtr, ciliated funnels; Ds,…

In the Trichina, a parasitic roundworm, the bodies of several animals, particularly the rat, are host for developing eggs. If the rat is eaten by a carnivorous animal, these excessively small young are liberated during the process of digestion and rapidly assume the adult condition in the alimentary canal, giving rise to young which pursue again the same course of development.

Roundworm

In the Trichina, a parasitic roundworm, the bodies of several animals, particularly the rat, are host…

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii of the pitch surfaces, the teeth of the wheels essentially being portions of screw surfaces. This kind of gearing is used in speed-reducing arrangements.

Screw-and-Worm Gearing

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii…

24. Various corals, 25. Razor-shell, 26. Cockle, 27. Various winkels, 28. Shore crab, 29. Father lasher, 30. Periophthalamus, 31. Lobworm, 32. Gunnel

Types of Seashore Life

24. Various corals, 25. Razor-shell, 26. Cockle, 27. Various winkels, 28. Shore crab, 29. Father lasher,…

"The <em>Phrygania striata</em> is over an inch long, of a fawn-color, with the exception of the eyes, which are black." &mdash; Goodrich, 1859

Great Red Sedge and Larva

"The Phrygania striata is over an inch long, of a fawn-color, with the exception of the eyes,…

"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous tbes of a whitish color, which are attached to stones or shells."&mdash;Finley, 1917

Serpula

"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous…

"A semicylindrical piece of wood, fitted with a handle...used for convenience in serving ropes...to prevent chafing. a, serving-mallet; b, 'wormed' rope 'parceled' with canvas; c, serving-yarn." -Whitney, 1911

Serving Mallet

"A semicylindrical piece of wood, fitted with a handle...used for convenience in serving ropes...to…

"This important insect is a native of the north of China; and a great portion of the supplies of silk for Europe and America are still derived from that country." &mdash; Goodrich, 1859

Silkworm Moth, Caterpillar, and Chrysalis

"This important insect is a native of the north of China; and a great portion of the supplies of silk…

Common in Europe, the slow-worm resembles a snake, but its internal structure is that of lizards.

Slow-worm

Common in Europe, the slow-worm resembles a snake, but its internal structure is that of lizards.

A series of Stylommatophorous Pulmonata, showing transitional forms between snail and slug.

Snail and Slug

A series of Stylommatophorous Pulmonata, showing transitional forms between snail and slug.

"A "still;" and, for condensing the vapor, vats are constructed, holding serpentine pipes or "worms," which present a greater condensing surface than if the pipe has passed directly through the vat." &mdash;Wells, 1857

Still

"A "still;" and, for condensing the vapor, vats are constructed, holding serpentine pipes or "worms,"…

"The body is composed of numerous joints or segments, each one resembling the others; these are often several hundreds in number, and the animal sinetunes attains a length of upwards of ten feet." It is furnished with hooks and suckers at the head, by means of which it anchors itself to the intestines of its victims." &mdash; Goodrich, 1859

Tape-worm

"The body is composed of numerous joints or segments, each one resembling the others; these are often…

Echinobothrium typus is a species of tapeworm distinguished by two fossettes with hooks on its head.

Tapeworm

Echinobothrium typus is a species of tapeworm distinguished by two fossettes with hooks on its head.

The cestodes or tapeworms (Toenia solium), are parasitic flatworms. The body is usually of great length up to 50 feet, and terminates in a head. From the head the body extends backwards in a ribbon-like body. Shown here is a tapeworm with the head showing in the upper lefthand corner.

Tapeworm

The cestodes or tapeworms (Toenia solium), are parasitic flatworms. The body is usually of great length…

The terebella medusa, out of its case.

Terebella medusa out of its case

The terebella medusa, out of its case.

Threadworm (Nematodes) or Roundworm is composed of many different species. In all the body is slender as in the "vinegar eel". This small worm, a millimeter or two in length, lives on the various forms of mold that grow in fermenting fruit juices. A tough cuticle surrounds the body, perserving its shape and at the same time protecting the delicate organs against the action of the acids in which it lives. In the treadworm the eggs develop within the body and the young are born with the form of the parent.

Threadworm

Threadworm (Nematodes) or Roundworm is composed of many different species. In all the body is slender…

"Trichina Spiralis is the name given to a peculiar nematoid worm which inhabits the muscles, usually of the pig. The viviparous females, originally living in rats, being about eight days after entering the intestines of their second host, a pig, to give birth to the larv&aelig;, which pass into various parts of the body, especially the muscles, where they coil up in a sack, or cyst, which eventually becomes calcareous and whitish. When pork thus infected is eaten the worms are set free in the stomach of their third host (man), and in three or four days there become sexually mature, each female being capable of producing 1,000 young."&mdash;(Charles Leonard-Stuart, 1911)

Trichina Spiralis

"Trichina Spiralis is the name given to a peculiar nematoid worm which inhabits the muscles, usually…

"Trichina Spiralis is the name given to a peculiar nematoid worm which inhabits the muscles, usually of the pig. The viviparous females, originally living in rats, being about eight days after entering the intestines of their second host, a pig, to give birth to the larv&aelig;, which pass into various parts of the body, especially the muscles, where they coil up in a sack, or cyst, which eventually becomes calcareous and whitish. When pork thus infected is eaten the worms are set free in the stomach of their third host (man), and in three or four days there become sexually mature, each female being capable of producing 1,000 young."&mdash;(Charles Leonard-Stuart, 1911)

Trichina Spiralis

"Trichina Spiralis is the name given to a peculiar nematoid worm which inhabits the muscles, usually…

Lefthand single thread worm and worm wheel.

Worm And Worm Wheel

Lefthand single thread worm and worm wheel.

Righthand single thread worm and worm wheel.

Worm And Worm Wheel

Righthand single thread worm and worm wheel.

The Fall Army Worm (Spodoptera frugipeda) is part of the order of Lepidoptera and are the caterpillar life stage of a moth. They are native to tropical regions of the western hemisphere, from the United States to Argentina. They are regarded as pests and are known to wreak havoc with crops if left to multiply. Their name is derived from their feeding habits. The army worms are some of the most destructive pests to agricultural crop in the world. Once the food supply is exhausted the entire "army" of worms will move to the next available food source.

Army Worm

The Fall Army Worm (Spodoptera frugipeda) is part of the order of Lepidoptera and are the caterpillar…

A marine worm at breeding season.

Marine Worm

A marine worm at breeding season.

A marine worm.

Marine Worm

A marine worm.

Band or Nemetean worms have been discovered in damp soil or in fresh-water streams. These are commonly small and inconspicuous, pigmies when compared with their marine relatives. Many are often found on the seashore under rocks that have been exposed by the retreating tide.

Nemetean

Band or Nemetean worms have been discovered in damp soil or in fresh-water streams. These are commonly…

Band or Nemetean worms have been discovered in damp soil or in fresh-water streams. These are commonly small and inconspicuous, pigmies when compared with their marine relatives. Many are often found on the seashore under rocks that have been exposed by the retreating tide. Shown here is the head, earing numerous eyes and spine-tipped proboscis.

Nemetean

Band or Nemetean worms have been discovered in damp soil or in fresh-water streams. These are commonly…

"The caterpillar of which, commonly known as the tobacco-worm in the Middle States, is very destructive to the leaf of the tobacco-plant, when the worm is young, by eating holes in the leaves, thus spoiling them for use as wrappers for cigars, and when old by devouring the whole of the leaf itself." -Watts, 1874

Tobacco worm

"The caterpillar of which, commonly known as the tobacco-worm in the Middle States, is very destructive…

This illustration shows a worm. Worms have an elongated soft-body. The most famous is the earthworm, but there are hundreds of thousands of different species that live in a wide variety of habitats other than soil.

Worms

This illustration shows a worm. Worms have an elongated soft-body. The most famous is the earthworm,…

"A wormy apple, showing the familiar mass of brown particles thrown out at the blossom-end by the young worm." &mdash; Goff, 1904

Wormy Apple

"A wormy apple, showing the familiar mass of brown particles thrown out at the blossom-end by the young…

"Section of wormy apple; a, codling moth; b, cocoon." &mdash; Goff, 1904

Wormy Apple

"Section of wormy apple; a, codling moth; b, cocoon." — Goff, 1904