Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 508 ARACIINIDA. eleven segments and no jointed anal filament. PJi. n-nifnrm-is Latr., in Brazil. Tlii-1 i/plioniis Latr. The cheliceras are short and end in a chela, their masti- cating blades fuse in the middle line. The elongated twelve-ringed abdomen with segmented anal filament. T. cinulfttiix in Java. Order 6.—SCORPIONIDEA* (SCORPIONS). Arachnida vuith chelate chelicerce, and elongated, p&llforni chelate pedipalpi, with a prce-abdomen composed of seven segments, and an elonga
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 508 ARACIINIDA. eleven segments and no jointed anal filament. PJi. n-nifnrm-is Latr., in Brazil. Tlii-1 i/plioniis Latr. The cheliceras are short and end in a chela, their masti- cating blades fuse in the middle line. The elongated twelve-ringed abdomen with segmented anal filament. T. cinulfttiix in Java. Order 6.—SCORPIONIDEA* (SCORPIONS). Arachnida vuith chelate chelicerce, and elongated, p&llforni chelate pedipalpi, with a prce-abdomen composed of seven segments, and an elongated post-abdomen of six segments, toith poison spine at the hind end ; with four pairs of lungs. The Scorpions have a cer- tain resemblance to the De- capod Crustacea in their powerful chelate pedipalpi and firm armour (fig. 410). The stout cephalo-thorax is joined to an elongated abdomen, which is divided into a cylin- drical pne-abdomen, composed of seven segments, and a very narrow six-segmented post- abdomen, which is curved dorsalwards. The post-abdo- men ends with a curved poison spine, which is provided with two poison glands. The cheli- cerfe are three-jointed and chelate; the pedipalpi end with a swollen terminal chela, while the basal joint serves with its broad grinding surface as a jaw. The four pairs of legs are strongly de- veloped and end with double claws. In their internal organization the Scorpions reach the highest * P. Gervais, ' Eemarqnes sur la famille des Scorpions et description de plusicurs especes nouvelles, etc.'? Arcli. <ln untser irhixt. IV. Newport, ' On the structure, relations, and development of the nervous and circulatory Systems in Myriapoda and macrourous Arachnida.' Phil. Trans. 1843. L. Dufour, ' Histoire anatomique et physiologique des Scorpions,' Mem. pros a Tiiriul. ils srinu-rx, XIV., 1S56. E. Metschnikoff, ' Embryologie des Scor- Sj' Zeltxch rf/ir ZnnJ., 1870. St FIG. 410.—Cephalo-thorax and pr£e-abdomen of Sc
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