550 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 41 



Fig. 1. Hippoporina porcellana (Busk), highly calcified zooecium 

 with minute tubercles and ovicell. 



Fig. 2. The same, diagram of aperture, avicularium and pores. 



Fig. 3. The same, operculum much enlarged. 



Fig. 4. Hippoporina contractu (Waters), zooecium, aperture, spines 

 and different types of avicularia. 



Fig. 5. The same, ovicell. 



Fig. 6. Hippoporina ampla new species, operculum. 



Fig. 7. The same, zooecium showing aperture, spines, disposition of 

 avicularia and marginal tubercles. 



Fig. 8. The same, ovicell. 



Fig. 9. Gemelliporella globulifera new species, showing aperture 

 and position of avicularia. 



Fig. 10. The same, distorted zooecium with two types of avicularia. 



Fig. 11. The same, ovicells. 



Fig. 12. The same, operculum. 



Fig. 13. Gemelliporina monilia new species, zooecium, ovicell, aper- 

 ture and graded spines. 



