Trepostomatous Bryozoa of the Hamilton group of New York State

partly resorbed in the growing tip region and active thinwalled growth followed, extending the neanic zones and branch lengths distally. The formation of new thick-walled zones around the tips completed the cycle. Proximal to the growing tips, the zooecia assumed permanent positions opening along the sides of the branches. Here growth was relatively constant with no sign of resorption and progressively older growth stages occur toward the bases of zoaria.