Entomology : with special reference to its biological and economic aspects . oda. there was no common ancestor of the Arthropoda as awhole, and that the group is a polyphyletic one. This icono-clastic view, however, by emphasizing unduly the structuraldifferences among arthropods, tends to conceal the many deep-seated resemblances that exist between the classes of Arthro-poda. Carpenter, in a most sagacious summary of the whole sub-ject of arthropod relationships, has recently brought togetherno little evidence in favor of a revised form of the old Miil-lerian theory of crustacean origins. He
Entomology : with special reference to its biological and economic aspects . oda. there was no common ancestor of the Arthropoda as awhole, and that the group is a polyphyletic one. This icono-clastic view, however, by emphasizing unduly the structuraldifferences among arthropods, tends to conceal the many deep-seated resemblances that exist between the classes of Arthro-poda. Carpenter, in a most sagacious summary of the whole sub-ject of arthropod relationships, has recently brought togetherno little evidence in favor of a revised form of the old Miil-lerian theory of crustacean origins. He traces all the classesof Arthropoda back to common arthropodan ancestors with adefinite number of segments and distinctly crustacean incharacter; then traces these primitive arthropods back toforms like the nauplius larva of Crustacea, and these in turn ENTOMOLOGY to a hypothetical form hke the trochosphere larva of recentpolych?ete annelids. Orders of Insects.—Linnseus arranged insects in sevenorders, namely, Coleoptera, Hemiptera, Lepidoptera, Neurop- Fig. 9. Fig.
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