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The thick shell or sheild which cover the back of the tortoise, or turtle, the crab, and other crustaceous animals.

The four large shell plates on the sides, and the five large ones of the middle, of the carapace of the sea turtle, which yield the best tortoise shell. De Colange.

See Carapace.

y are mostly marine, and usually have a broad, short body, covered with a strong shell or carapace. The abdomen is small and curled up beneath the body.

(Paleon.) The reflexed margin of the trilobite carapace.

Over the stomach; -- applied to two of the areas of the carapace of crabs. Epigastric region. (Anat.) (a) The whole upper part of the abdomen. (b) An arbitrary division of the abdomen above the umbilical and between the two hypochondriac regions.

t. -- Masked crab (Zoöl.), a European crab (Corystes cassivelaunus) with markings on the carapace somewhat resembling a human face. -- Masked pig (Zoöl.), a Japanese domestic hog (Sus pliciceps). Its face is deeply furrowed.

Of or pertaining to a region of the carapace of a crab covering the middle branchial region.

Of or pertaining to the middle gastric lobe of the carapace of a crab.

Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiæ.

Of or pertaining to the two posterior gastric lobes of the carapace of crabs.

the back, or nape, of the neck; -- applied especially to the anterior median plate in the carapace of turtles.

The part of the carapace of a crustacean situated behind the cervical groove.

he genus Porcellana and allied genera (family Porcellanidæ). They have a smooth, polished carapace. -- Porcelain jasper. (Min.) See Porcelanite. -- Porcelain printing, the transferring of an impression of an engraving to porcelain. -- Porcelain shell (Zoöl.), a cowry.

osterior end of the backbone; -- applied especially to the posterior median plates in the carapace of chelonians.

The anterior, often spinelike, prolongation of the carapace of a crustacean, as in the lobster and the prawn.

toises. The body is covered by a shell consisting of an upper or dorsal shell, called the carapace, and a lower or ventral shell, called the plastron, each of which consists of several plates.

A small American fresh-water tortoise (Chelopus, or Nanemys, quttatus) having a blackish carapace on which are scattered round yellow spots. -- Tortoise beetle (Zoöl.), any one of numerous species of small tortoise-shaped beetles. Many of them have a brilliant metallic luster. the larvæ feed upon the leaves of variou…

at the same time. -- Triangular crab (Zoöl.), any maioid crab; -- so called because the carapace is usually triangular. -- Triangular numbers (Math.), the series of numbers formed by the successive sums of the terms of an arithmetical progression, of which the first term and the common difference are 1. See Figurate…

Behind the stomach; -- said of two lobes of the carapace of certain crustaceans.