Elementary Text book of Zoology volume 1

Cover Elementary Text book of Zoology volume 1
Elementary Text book of Zoology volume 1
Carl Friedrich Wilhelm Claus
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The heart lies in the abdomen, and is a long, many-chambered dorsal vessel with lateral slits through which the blood enters. It is fre- quently continued into an anterior and posterior aorta, and in Scorpions gives off in addition lateral branching arteries. The organs of respiration are internal air chambers, which have the form either of ramified tubes (trachece), or of hollow lamellae (fan-trachece, lungs) placed upon one another in great number like the leaves of a book and connected toget...her by trabeculse so as to have the form of a sac. The air chambers are always kept open by a firm internal chitinous membrane, so that the air can enter by the paired openings (stig- mata) of the tracheae or lungs at the beginning of the abdomen, and be distributed to the finest ramifications. The chitinous lining may become thickened so as to give rise to a spiral fibre. Generative organs. With the exception of the hermaphrodite Tardigrada, all the Arachnida are of separate sexes. The males are frequently distinguished by external characteristics, as for example by their smaller size, by the possession of organs of attachment (Mites), or by the modification of certain appendages.

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