Plate XXX. 



Fig. 112. Sertularella pinnata. 



A. Natural size. 



B. Portion of colony showing mode of branching, hydrothecse and 



gonangia. 



Fig. 113. Sertularella polyzonias. 



A. Natural size. 



B. Portion of branch showing hydrotheca-. 



C. Gonangium. 



Fig. 114. Sertularella rugosa. 



A. Natural size. 



B. Portion of stem showing hydrothecse and gonophore. 



C. Gonangium showing teeth. 



Fig. 115. Sertularella tanneri. 



A. Natural size. 



B. Portion of branch showing hydrothecœ. 



