Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 496 AEACHNIDA. the Mites and Spiders amongst the Arachnida, although they possess a greater number of appendages than either, inasmuch as the males have an accessory pair of legs, used in carrying the eggs (fig. 389, A B}. They are small animals with a conical suctorial proboscis and rudimentary abdomen (reduced to a tubercle); and they live in the sea, and crawl slowly about amongst the sea-weeds. There are four pairs of very long, many-jointed legs, which contain tubular cliver- ticula
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 496 AEACHNIDA. the Mites and Spiders amongst the Arachnida, although they possess a greater number of appendages than either, inasmuch as the males have an accessory pair of legs, used in carrying the eggs (fig. 389, A B}. They are small animals with a conical suctorial proboscis and rudimentary abdomen (reduced to a tubercle); and they live in the sea, and crawl slowly about amongst the sea-weeds. There are four pairs of very long, many-jointed legs, which contain tubular cliver- ticula of the stomach and the sexual glands. There are no tracheae. On the other hand, there is a well-developed heart with an aorta FIG. 300.—Ammothea pygnogunoides (regne animal). Da, prolongations of alimentary canal into the legs. and several lateral ostia. Above the brain lie four small simple eyes. There is a considerable ventral chain, composed of several ganglia. The eggs are carried about on the accessory pair of legs on the thorax of the male (fig. 389) till the larvae are hatched. Pygnogonum littoral <• 0. Fr. MUller, North Sea. Pho-ri chili (Hum Edw., Awimothc-a Leach, A. pygnogonoides Quatr. (fig. 390). TARDIGRADA.* The Tardigrada constitute a second group, which is often separated as a distinct order. They are small mite-like Arachnida, and may * Doyere, ' Mdmoire sur les Tardigrades.'' Ann. tffx XT-. ICttt., IP Ser., Tom. XIV., XVIII. C. A. S. Schultze, ' Macrobiotus Hnfelandii, etc,' Berolini, 1834. C. A. S. Schultze, ' Echiniscus Bellermanni,' Berolini, 18-iU. Dnjardin,
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