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Sturcture of the Breathing Organs of Porcellio scaber
A, Exopodite of first pleopod, showing the tuft of air-tubes ('pseudo-tracheae'), seen through the transparent cuticle; B, vertical section through same; C, part of section more highly magnified; art, Point of attachment of exopodite to peduncle; c, cuticle; gr, grooved area of cuticle; hy, hypodermis, or layer of cells under the cuticle; n, nucleus of hypodermis cell of air-tube; o, external opening; tr, air-tubes

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