Text-figure 9. — Cephalodiscus gilchristi. Figures illustratins: 

 j,lie development of the plumes of the buds. J is a dorsal view, and 

 K and L ventral views of the collar and appendages (plumes and 

 post-oral lamella); the other figures are dorsal views of complete buds. 

 The first pair of plumes are just appearing in D, the second in E, the 

 third in G, the fourth in H, and the fifth in K. All figures enlarged 

 62 diameters. For explanation of the lettering see end of paper. 



