...They grow by preference in connective tissue andare quite vascular... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The ventral halfis essentially the vegetative half of the body, and contains the greater partof the vertebrate’s vegetal organs, the visceral and vascular systems,sexual system, etc...
Ernst Haeckel 「The Evolution of Man」
...Each vertebra is directly connected with a special section ofthe muscular system, the nervous system, the vascular system, etc...
Ernst Haeckel 「The Evolution of Man」
...The earliest Vermalia in which we first find this independent vascular systemare the Nemertina (Fig...
Ernst Haeckel 「The Evolution of Man」
...The further evolution ofthis rudimentary vascular system can be gathered from the class of the Annelidsin which we find it at various stages of development...
Ernst Haeckel 「The Evolution of Man」
...As we have seen, the Amphioxus has no real heart; itscolourless blood is driven along in its vascular system by the principal vesselitself, which contracts regularly in its whole length (cf...
Ernst Haeckel 「The Evolution of Man」
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