528 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 30 



Fig. 1. Hippothoa hyalina (Linnaeus), zooecia of typical form with 



interzooecial fenestrae. 

 Fig. 2. The same, with suboral umbo. 

 Fig. 3. The same, modified zooeciura with ovicell. 

 Fig. 4. The same, with lateral-oral processes. 

 Fig. 5. The same, lateral processes and central umbo. 

 Fig. 6. Hippothoa divaricata Lamouroux, zooecia and ovicell. 

 Fig. 7. Hippothoa fiagellum Manzoni, elongate base and mode of 



branching. 

 Fig. 8. The same, ovicell. 

 Fig. 9. Hippothoa expansa Dawson, zooecia, reduced zooecium with 



ovicell, and expanded base. 

 Fig. 10. Trypostega <venufta (Norman), zooecia, ovicell and zoo- 



eciules. 

 Fig. 11. Trypostega claviculata (Hincks), zooecia, ovicell and zoo- 



eciule with clavate avicularium. 



