Reports

A Primitive Heart in the Echinoid Strongylocentrotus purpuratus

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Science  10 Jul 1964:
Vol. 145, Issue 3628, pp. 173-175
DOI: 10.1126/science.145.3628.173

Abstract

A pulsating vessel and a compartmented contractile chamber have been found to move coelomic fluid from the perivisceral cavity into and throughout the hemal system of the sea urchin, Strongylocentrotus purpuratus.