200 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 1 



Fig. 1. A etea truncata {Landshorough) . 



Fig. 2. Aetea recta Hincks. 



Fig. 3. Aetea angu'tna (Linnaeus). 



Fig. 4. Aetea liffulata Busk. 



Fig. 5. S cruparia arnbiffua (d'Orh'igny). 



Fig. 6. fwcra/f a /orzVa^a (Linnaeus), frontal view and branching. 



Fig. 7. The same, side view. 



Fig. 8. Membranipora mcbranacea (Linnaeus). 



Fig. 9. The same, showing a "tower cell." 



Fig. 10. Membranipora villosa (Hincks), normal zooecium above with 

 chitinous frontal spinules, below the twinned ancestrula with 

 bases of five buds. 



Fig. H. The same, showing chitinous corner spines and a larger one at 

 the division of a series of zooecia. 



Fig. 12. Membranipora serrilamella, new name, average development 

 of the cryptocyst. 



Fig. 13. The same, showing development of the tubercles by folding 

 of the distal wall. 



Fig. 14. Membranipora fusca, new species. 



