552 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



370 



PLATE 42 



Fig. 1. Stephanosella biaperta (Michelin), infertile zooecium with 

 aperture, lateral-oral avicularia and areolar pores. 



Fig. 2. The same, ovicell and frontal avicularium. 



Fig. 3. Stephanosella bolini new species, zooecium, aperture, oral 

 and frontal avicularia. 



Fig. 4. The same, ovicell and avicularia. 



Fig. 5. The same, operculum. 



Fig. 6. Stephanosella v'ttrea new species, infertile zooecium, aper- 

 ture and avicularia. 



Fig. 7. The same, ovicell. 



Fig. 8. The same, operculum. 



Fig. 9. Aimulosia palliolata (Canu and Bassler), different degrees 

 of calcification of the ovicell. 



Fig. 10. The same, marginal zooecium with details of aperture, 

 spines, avicularium and encircling umbo. 



Fig. 11. The same, operculum much enlarged. 



Fig. 12. Hippoporidra granulosa Canu and Bassler, marginal zoo- 

 ecium showing spines, aperture and frontal granulation. 



Fig. 13. The same, very advanced calcification. 



Fig. 14. The same, operculum much enlarged. 



