Text-book of comparative anatomy . , not only is theanterior division of the body,answering to the cephalo-thorax,distinctly segmented, but it evenfalls into two parts, an anteriorunsegmented head, which may becompared with the head of theAntennata, and a posterior thorax,consisting of three segments, whichmay be compared with the thoraxof the Insecta and with the threeanterior trunk segments of theMyriapoda. An abdomen of tensegments follows the thorax. There are considerable difficulties inthe way of comparing the segments of thebody of the Solpucjidce with the head anda corresponding number
Text-book of comparative anatomy . , not only is theanterior division of the body,answering to the cephalo-thorax,distinctly segmented, but it evenfalls into two parts, an anteriorunsegmented head, which may becompared with the head of theAntennata, and a posterior thorax,consisting of three segments, whichmay be compared with the thoraxof the Insecta and with the threeanterior trunk segments of theMyriapoda. An abdomen of tensegments follows the thorax. There are considerable difficulties inthe way of comparing the segments of thebody of the Solpucjidce with the head anda corresponding number of trunk segmentsof the Antennata ; these difficulties arisechiefly in comparing the extremities andnervous system, and will be discussed lateron. The ontogeny of the Solpugidce isunfortunately almost unknown. In the Scorpionidce (Fig. 359)the cephalo-thorax is, in the adultcondition, unsegmented; in theembryo, however, a segmentation into seven somites, including thefrontal lobes, may be recognised. The abdomen, on the contrary,. Fig. 359.—Scorpio africanus (after Cuvier,Regne animal). VI A RA GHNOIDEA—0 UTER ORGAN IS A TION 513
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
