"Portion of the corallum of Astylus subvividis (one of the Stylasteridae), showing cyclosystems placed at intervals on the branches, each with a central gastropore and zone of slit-like dactylopores." — Encyclopedia Britannica, 1893

Astylus Subvividis

"Portion of the corallum of Astylus subvividis (one of the Stylasteridae), showing cyclosystems placed…