578 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 55 



Fig. 1. RhyncJiozoon sp'tcatum new species, zooecium with spicate 

 avicularian umbo and bases of spines. 



Fig. 2. The same, tihed backward to show position of avicularium. 



Fig. 3. The same, ovicell and frontal avicularium. 



Fig. 4. Schizotheca umbonata new species, zooecium with ovicell and 

 tall erect umbo. 



F'ig. 5. Scliizotheca fissurella (Hincks), zooecium with ovicell and 

 frontal avicularium. 



Fig. 6. Rliyncliozoon bispinosum (Johnston), young zooecia, form 

 of aperture, position of spines and avicularia. 



Fig. 7. The same, older zooecium of secondary layer with ovicell. 



Fig. 8. Hippoporidra spiculifera (Canu and Bassler), young zooe- 

 cia with spines and frontal avicularium. 



Fig. 9. The same, older zooecium with spiculate umbo on suboral 

 border and ovicell. 



Fig. 10. The same, operculum. 



Fig. 11. Veleroa veleronis new species, operculum. 



Fig. 12. Holoporella quadrispinosa Canu and Bassler, marginal zoo- 

 ecium, spines, form of aperture, suboral avicularium, form 

 and position of frontal avicularium. 



Fig. 13. Gemelliporella aviculifera new species, zooecia with ovicell 

 and erect pedicellate avicularian chamber. 



Fig. 14. Gemelliporidra lata new species, zooecia, form of aperture, 

 ordinary frontal avicularia and giant avicularium. 



