98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



PLATE 12 



Fig. 57. Synlhcduin syminctru uin 



a. Portion of branch showing arrangement of hydrothecae. 



b. Portion of stem showing origin of liranches. 



c. Gonangia. 



Fig. 58. Sertularella ampullacea 



Portion of colony showing branching and hydrothecae. 



Fig. 59. Sertularella exilis 



a and b. Portions of colon}' showing arrangement of 

 hydrothecae. 



Fig. 60. Sertularella itnisa 



a. Portion of stem showing branching. 



b. Portion of branch. 



