534 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 33 



Fig. 1. Hincksipora spinulifera (Hincks), fertile zooecium with ovi- 



cell, broad peristome and median spinule. 

 Fig. 2. The same, younger infertile zooecium. 

 Fig. 3. The same, diagram of longitudinal section. 

 Fig. 4. The same, outline of operculum with muscle attachments. 

 Fig. 5. Pachyegis princeps (Norman) zooecium with umbo, reduced 



one-half. 

 Fig. 6. The same, showing form of aperture and avicularium at 



base of umbo. 



The same, ovicell. 



The same, operculum with broad sclerites. 



Pachyegis brunnea (Hincks), infertile zooecium showing 



aperture, avicularium and umbo. 



The same, younger zooecium showing avicularian chamber. 



The same, ovicell. 



