Plate II. 



Fig. 3. Lictorella cervicornis. 



D. Portion of fascicled stem. 



Fig. 4. Thuiaria carica. 



A. Portion of colony, natural size. 



B. Portion of branch showing arrangement of hydrothecae. 



C. Portion of stem showing method of branching. 



D. Gonangia (After Broch). 



Fig. 5. Plumularia plumular aides. 



A. Colonies, natural size. 



B. Cauline internode and hydrocladium showing arrangement o i 



gonophores (male in this instance). 



C. Female gonophore. 



Note. — Magnification 20 diameters unless otherwise indicated. 



