558 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 45 



Fig. 1. Microporella coronata (Audouin), zooecium, ovicell and 

 especially the form of the avicularia. 



Fig. 2. Microporella tractabilis Canu and Bassler, note the ex- 

 tremely elongate and parallel mandibles. 



Fig. 3. Fenestrulina malusi (Audouin), zooecium, and ovicell; 

 note presence of pores between ascopore and aperture. 



Fig. 4. Hippoporella nitesceiis (Hincks), zooecium, form of aper- 

 ture and two types of avicularia. 



Fig. 5. The same, operculum. 



Fig. 6. Hippoporella riinata new species, zooecia, form of aperture 

 with small avicularium and tubercles; ovicell with elon- 

 gate membranous area- 

 Fig. 7. The same, operculum. 



Fig. 8. Hippoporella hippopus (Smitt), zooecium with frontal 

 tubercles, avicularium, spines and aperture. 



Fig. 9. The same, operculum. 



Fig. 10. Hippoporella gorgonensis Hastings, marginal zooecium show- 

 ing spines and paired avicularia. 



Fig. 11. The same, zooecium and ovicell in full calcification. 



Fig. 12. The same, operculum, much enlarged. 



Fig. 13. Hippoporida janthina (Smitt), young marginal zooecia. 



Fig. 14. The same, zooecium of secondary layer with ovicell. 



Fig. 15. The same, operculum, greatly enlarged. 



Fig. 16. Aimulosia uvulifera (Osburn), young zooecium, showing 

 aperture, avicularium and simple umbonate process. 



Fig. 17. The same, complete calcification, with ovicell. 



