. The causes and course of organic evolution; . pecies of the component genera of the groups. But the objection may, at least on first glance, be perti-nently urged, that the Apoda are scaled animals while themain groups emphasized above have been scaleless. To thisit can be replied that a smaller half of the living genera ofApoda are scaleless, while even the scaled genera have thescales formed deeper in the body substance and in a quitedifferent manner embryologically from true scales. Theymight well, therefore, be designated the Pseudolepidapoda. 474 Causes and Course of Organic Evolution F
. The causes and course of organic evolution; . pecies of the component genera of the groups. But the objection may, at least on first glance, be perti-nently urged, that the Apoda are scaled animals while themain groups emphasized above have been scaleless. To thisit can be replied that a smaller half of the living genera ofApoda are scaleless, while even the scaled genera have thescales formed deeper in the body substance and in a quitedifferent manner embryologically from true scales. Theymight well, therefore, be designated the Pseudolepidapoda. 474 Causes and Course of Organic Evolution Finally, while we have stated that the true fishes, as a greatgroup, form a side line of development that has not now con-cerned us, it should be conceded that living Dipnoi show manyresemblances to the Batrachia, and not least to the point along with other phylogenetic details will be con-sidered later. The family tree facing this page may repre-sent for us the supposed relations existing between the groupsstudied up to the
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