560 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 46 



Fig. 1. Porella compressa (Sowerby), outline of zooecium with sec- 

 ondary aperture ?nd areolar pores. 



Fig. 2. The same, internal view of aperture with very broad low 

 lyrula. 



Fig. 3. The same, with ovicell. 



Fig. 4. Porella acutirostr'ts Smitt, with ovicell and avicularium. 



Fig. 5. Porella concinna (Busk), zooecium with ovicell and secon- 

 dary aperture. 



Fig. 6. The same, young zooecium with primary aperture, spines 

 and developing avicularian chamber. 



Fig. 7. Porella columbiana O'Donoghue, zooecium and ovicell. 



Fig. 8. The same, young zooecium showing aperture, spines and 

 developing avicularian chamber. 



Fig. 9. Porella porifera (Hincks), zooecium and ovicell (the avicu- 

 larian chamber is smaller than usual). 



Fig. 10. The same, details of aperture of young zooecium. 



Fig. 11. The same, zooecium with numerous avicularia, from mar- 

 ginal area of large colony. 



Fig. 12. Porella patens new species, zooecium with ovicell and flar- 

 ing secondary aperture. 



Fig. 13. The same, operculum, much enlarged. 



Fig. 14. Codonellina anatina (Canu and Bassler), young zooecium. 



Fig. 15. The same, with ovicell. 



Fig, 16, Codonellina cribriformis (O'Donoghue), zooecium with ovi- 

 cell and details of aperture. 



