. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 503 ARACIIXIDA. eleven segments and no jointed aiial filament. Ph. rtniforniix Latr., in Brazil. ThflyjrttoHUs Latr. The chelicerae 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. caudatus Fabr., in Java. Order 6.—SCORPIONIDEA* (SCORPIONS). Arachnida with chelate chelicerce, and elongated, pediform chelate pedipalpi, with a prce-abdomen composed of seven segments, and an elongated post-abd
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 503 ARACIIXIDA. eleven segments and no jointed aiial filament. Ph. rtniforniix Latr., in Brazil. ThflyjrttoHUs Latr. The chelicerae 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. caudatus Fabr., in Java. Order 6.—SCORPIONIDEA* (SCORPIONS). Arachnida with chelate chelicerce, and elongated, pediform chelate pedipalpi, with a prce-abdomen composed of seven segments, and an elongated post-abdomen of six segments, with 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 prse-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- cerse 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, " Remarques sur la famillc des Scorpions et description de plusieurs especes nouvelles, ; Arch. <lu mum'-i- </'/<i*t. IV. Newport, "On the structure, relations, and development of the nervous and circulatory Systems in Myriapoda and macrourous Arachnida," Phil. Trait*. 184:?. L. Dufour, " Histoirc anatomiquc et physiolngique des Scorpions," Mun. pres a Tacad. des sciences, XIV., 18o6. E. Metschnikoff, " Embryologie des Scor- pions," Ztiitsclirfar miss., Zool., F:o. 410.—Cephalo
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