528 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 30 



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

 interzooecial fenestrae. 

 The same, with suboral umbo. 

 The same, modified zooecium with ovicell. 

 The same, with lateral-oral processes. 

 The same, lateral processes and central umbo. 

 Hippothoa divaricata Lamouroux, zooecia and ovicell. 

 Hippothoa fiagellum Manzoni, elongate base and mode of 

 branching. 

 The same, ovicell. 



Hippothoa expansa Dawson, zooecia, reduced zooecium with 

 ovicell, and expanded base. 



Trypostega venusta (Norman), zooecia, ovicell and zoo- 

 eciules. 



Trypostega claviculata (Hincks), zooecia, ovicell and zoo- 

 eciule with clavate avicularium. 



