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Scene showing various animals of the Division <em>Articulata</em>.

Articulata

Scene showing various animals of the Division Articulata.

Insects have neither arteries nor veins. The circulation, such as it is, is animated by the action of a vessel called dorsal, which is situated above the digestive tube. Labels: 1, Dorsal vessels in which the blood flows. 2,The lateral currents. The arrows show the outward and the inward current.

Diagram of the Circulation of an Insect.

Insects have neither arteries nor veins. The circulation, such as it is, is animated by the action of…

"The anterior feet are about the length of the body. The other feet terminate in an elongated claw, which is straight-pointed."

Corystes Cassivelaunus, female

"The anterior feet are about the length of the body. The other feet terminate in an elongated claw,…

"The Long-clawed Crab is remarkable for its long antennae, which considerably exceed the length of the body."

Corystes Cassivelaunus, male

"The Long-clawed Crab is remarkable for its long antennae, which considerably exceed the length of the…

A large crab.

Mask Crab

A large crab.

"Crawfish, or Crayfish is a name of various crustaceous animals, the common crawfish being the river lobster. It lurks under stones or in holes in the banks. Its food consists of small mollusks or fishes, the larv&aelig; of insects, and almost any sort of animal matter. Some crawfish by their burrowing habits injure mill-dams and the levees of the Mississippi."&mdash;(Charles Leonard-Stuart, 1911)

Crawfish

"Crawfish, or Crayfish is a name of various crustaceous animals, the common crawfish being the river…

A fluviatile longtailed crustacean.

River Crawfish

A fluviatile longtailed crustacean.

In the class of Crustacea there is a single ventricle, which receives the blood from the gills and propels it to other parts of the body. Shown is the heart and arteries of a lobster. Labels: 1, The heart. 2, The abdominal artery. 5, Venous sinuses. 6, The branchia from which the blood returns to the hear.

The Heart and Arteries of a Lobster

In the class of Crustacea there is a single ventricle, which receives the blood from the gills and propels…

External features of the lobster.

Lobster

External features of the lobster.

Lobsters have five pair of legs. The first pair are modified into claws for defense.

Lobster

Lobsters have five pair of legs. The first pair are modified into claws for defense.

Common lobster. I. first pair of legs; 2 and 3. second and third pairs of legs; 4 and 5. last two pair of legs; a smaller antennae; ga greater antennae; ca carapace.

Lobster

Common lobster. I. first pair of legs; 2 and 3. second and third pairs of legs; 4 and 5. last two pair…

"Bilaterally symmetrical bodies composed of a series of rings or segments, each of which bears a pair of jointed appendages, or limbs; a well developed and symmetrical nervous system of many connected ganglia. The lower arthropoda are the crustaceans, such as the lobster." &mdash; Hinman, 1888

Lobster

"Bilaterally symmetrical bodies composed of a series of rings or segments, each of which bears a pair…

A large marine crustacean somewhat resembling a crawfish, but larger in form. The common lobster of America is a typical species. It is ten-footed, has a long tail, is stalk-eyed, and often attains a weight of ten pounds.

Lobster

A large marine crustacean somewhat resembling a crawfish, but larger in form. The common lobster of…

Larva of lobster removed from egg shell.

Lobster

Larva of lobster removed from egg shell.

The lobster, a crustacean.

Lobster

The lobster, a crustacean.

Lobster claw.

Lobster

Lobster claw.

An illustration of a lobster fossil.

Lobster Fossil

An illustration of a lobster fossil.

A young lobster cracked his tooth on a clam, learning a hard lesson.

Lobster Lesson

A young lobster cracked his tooth on a clam, learning a hard lesson.

"The Spiny Lobster, <em>Palinurus vulgaris</em>, which may be taken as the type of the family, often weighs as muich as twelve or fifteen pounds. It was in great esteem among the ancient Romans, who denominated it <em>Locusta</em>. &mdash; Goodrich, 1859

Spiny lobster

"The Spiny Lobster, Palinurus vulgaris, which may be taken as the type of the family, often…

"Norway Lobsters have the eyes uniform and the two last rings of the thorax movable."

Nephrops Norvegicus

"Norway Lobsters have the eyes uniform and the two last rings of the thorax movable."

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs seek out a shell to inhabit and will kill a living mollusk to take its home.

Pagurus Bernhardus, In the Shell

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs…

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs seek out a shell to inhabit and will kill a living mollusk to take its home.

Pagurus Bernhardus, Out of the Shell

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs…

"The common crayfish. Crustaceans are nearly all carnivorous. <em>a</em>, left outward root-jaw"

Palinurus Vulgaris

"The common crayfish. Crustaceans are nearly all carnivorous. a, left outward root-jaw"

"Among some Crustaceans there is neither thorax, nor abdomen, nor head, but all three form only one mass, often short and squat, as in the Four-horned Spider-crab."

Pisa Tetraodon

"Among some Crustaceans there is neither thorax, nor abdomen, nor head, but all three form only one…

a: external antenna; b: external foot-jaw; c: tail or abdomen.

Portunus Variegatus, male

a: external antenna; b: external foot-jaw; c: tail or abdomen.

A shrimp of the corophium genus.

Shrimp

A shrimp of the corophium genus.

"The lowest division of articulate animals is the Crustacea. Their name signifies a hard crust of covering, with which the animals are protected."

Zoea Taurus

"The lowest division of articulate animals is the Crustacea. Their name signifies a hard crust of covering,…