568 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 50 



Fig. 1. Rhamphostomella fortissima Bidenkap, zooecium, ovicell and 



avicularia; reduced one-half. 

 Fig. 2. The same, giant avicularium, not reduced. 

 Fig. 3. Rhampliostomella liincksi Nordgaard, zooecium with ovicell. 

 Fig. 4. Rhamphostomella curv'trostrata O'Donoghue, showing the 



lyrula, ovicell and avicularium. 

 Fig. 5. Rhamphostomella gigantea new species, showing aperture, 



ovicell, avicularium and costate front with a few pores, 



reduced one-half. 

 Fig. 6. Rhamphostomella ovata (Smitt), zooecium with scattered 



pores, aperture and avicularium. 

 Fig. 7. Rhampliostomella costata Lorenz, zooecium, avicularian 



umbo and aperture. 



