572 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 52 



Fig. 1. Mucronella labiata (Boeck), zooecium with ovicell. 



Fig. 2. The same, diagramatic side view. 



Fig. 3. Mucronella •ventricosa (Hassall), zooecium, ovicell and de- 

 tails of aperture. 



Fig. 4. Mucronella major (Hincks), zooecium and ovicell, the com- 

 plete array of spines and the peculiar frontal pores. 



Fig. 5. The same, diagram of side view. 



Fig. 6. Afwcrow^//a fowre^f^^nj (Ridley), zooecium and ovicell. 



Fig. 7. The same, diagram of young marginal zooecium showing 

 details of aperture and the very elongate dietellae. 



Fig. 8. //^/nzVj'c/o/iora />o/i/a (Norman), zooecium and ovicell. 



Fig. 9. Rhamphostomella cellata (O'Donoghue), with details of ap- 

 erture ; note especially the minute avicularium conforming to 

 the peristomial rim. 



Fig. 10. Rhamphostomella bilam'tnata (Hincks), zooecium with ovi- 

 cell ; note secondary aperture with high peristomial lappet 

 and elevated avicularium. 



