Annelid a (ANNUL AT A)

Articulated worms, having a brain, circum-œsophageal nerve ring, a ventral nerve chain, a vascular system and often setæ, or proce es for locomotion. Many are hermaphrodite, and some multiply asexually by transverse division, the segments having retained a measure of individuality. They form the sub-cla es Chatopoda, Gephyrca, and Hirudinea. Nereis pelagic a.