Plate 10. 



Sertularella tropica, page 14. 

 Fig. 1. An entire colony, x 12. 



Fig. 2. Part of a colony showing origin of branches, x 12. 

 Figs. 3, 3b. Two hydrothecae enlarged, x 80. 



Aglaophenia struthionides, page 18. 

 Fig. 4. A stem from off Hood Island, natural size. 

 Fig. 5. An entire colony from Southern California, natural size. 

 Fig. 6. Part of Fig. 4 enlarged. 



