540 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 36 



Fig. 1. //i//o^/^«ri/^ra mwcroKflfa (Sraitt), ovicell and aperture. 



Fig. 2. f/m^o/iu/a /a/^nj (Sraitt), infertile zooecium. 



Fig. 3. The same, ovicell. 



Fig. 4. Umbonula alvareziana (d'Orbigny), zooecium, aperture and 

 avicularia. 



Fig. 5. The same, operculum. 



Fig. 6. Umbonula arctica (Sars), zooecium with paired oral avicu- 

 laria. 



Fig. 7. Ragionula rosacea (Busk), zooecium, aperture, avicularium. 



Fig. 8. Lacerna fistulata (O'Donoghue), zooecium with ovicell in 

 complete calcification. 



Fig. 9. The same, at a younger stage, with ovicell and fistula-like 

 avicularian umbo. 



Fig. 10. The same, young zooecium with low umbo and avicularium. 



Fig. 11. The same, operculum, enlarged. 



