Abstract
Systematic rules for the OrdoOstracoda are results of two different ways of study. Palaeontologists consider for systematic purpose the shell to be of the highest importance whereas zoologists prefer to use the differences of the interior. These two different ways of consideration are of no significance for the Palaeozoic and Mesozoic species, however of greatest importance for the Cenozoic ostracoda. There are many species with “homoeomorph” shells which are stated by zoologists according to the form of their interior only. On hand of the genusCandona, the author tries to explain that “homoeomorphism” is not present if the form of the shell would be studied in a more subtile way. Negligence of the form of the shell in the zoological system is not justified. Species which differ in the form of their members have sufficiently distinct differences with regard to their shells too.
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