Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 126 ELEMENTS OF BIOLOGY really connotes that the various phyla have appeared in the order given, but the historical origins are in most cases by no means clear. As an example of procedure in establishing the position of an ani- mal the simplest possible method has been given, namely, comparing the external features of the adult house fly with those of other ani- mals and classifying it according to similarities and dissimilarities. But the speci
Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 126 ELEMENTS OF BIOLOGY really connotes that the various phyla have appeared in the order given, but the historical origins are in most cases by no means clear. As an example of procedure in establishing the position of an ani- mal the simplest possible method has been given, namely, comparing the external features of the adult house fly with those of other ani- mals and classifying it according to similarities and dissimilarities. But the specialist has still other criteria that show relations between animals. Regardless of the apparent differences in the structure of adult animals, it is considered that animals which pass through the PROTOTROCH MOUTH MOUTH / Jte,.; ^^^. J^..,^.;^^=— METATROCH PROTONEPHRIDIUM
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