PI. I. 



Fig. 1—5. Bugula harmsworthi, Waters, ^/j 1900, Vinterhavnen. 



1. Zooecium and Ooecium. frontal view, °''/,. 



2. The anterior part of a Zooecium, lateral view, ''/j. 



3. Zooecia, dorsal view, o, Ooecium, e, terminal wall, '^/i. 



4. Zooecium, lateral view, rp, rosette-plates, ^'/i. 



5. Avicularium, '^/i. 



6. Flustra serrulata, Busk, ^^/^ 1900, Vinterhavnen. '/i' 



7 — 9. Memhranipora nigrans, Hincks, ^"/g 1901, Gaasefjord. 



7. Terminal wall with rosette-plates, *^/,. 



8. Ooecium, frontal view, rp, rosette-plates, dv, distal wall, pv, proximal wall 

 of the ooecium, *'/,. 



9. Lateral wall of the zooecium, a, avicularium, ''^/,. 

 10—11. ScMsoporella stormi, Nordg., ^'/^ 1900, Vinterhavnen. 

 10. Frontal wall of the Zooecium, ^^Z,. 



- 11. Ooecium, "/,. 



12—14. Schizoporella biaperta, Michelin, ^^f.; 1900, Vinterhavnen. 



- 12. Zoojcia, =2/i- 



- 13. Mandihle, ^Vi- 



14. Operculum, mf, muscular insertion, *^/i. 



