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They acquire special epithelial partitions, and type the primary trunks and network of smaller vessels found in animals with a canalicular vascular system, or the large sinus-like spaces characteristic of animals with a haemocoelic body-cavity. There are two major strategies during which new organs are developed. The process may also be traced within the embryos of Peripatus, where the principle options are essentially much like those above described (op. Many different instances, roughly plausible, of a like retention of ancestral options by larvae may be mentioned, and it have to be conceded that there are sturdy reasons for supposing that larvae usually retain traces, roughly complete, of ancestral phases of structure. That rationalization, which is a deduction from the idea of evolution, is to the effect that the peculiar embryonic structures and relations simply mentioned are because of the retention by the embryo of options which, as soon as possessed by the adult ancestor, have been lost within the course of evolution.
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