218 Puget Sound Marine Sta. Pub. Vol. 1, No. 19 



PLATE 37 

 (All drawings made with camera lucida except Figs. 8 and 9.) 



1. Utricle with young gametangium. X 75. 



2. Old utricle with branches, two of them beginning to grow downward. 

 X 75. 



3. Utricle with branches, one showing how a new filament may develop. 

 X 75. 



4. Utricle and gametangium. X 75. 



5. Upper and lower ends of a filament developed from one like Fig. 3 ; not 

 yet attached. X 75. 



6. Filament with holdfast. X 75. 



7. Holdfast, the lower end of a filament. X 75. 



8. An unusual structure showing how utricles develop from the tips of 

 the older ones. X 75. 



9. Tip of utricle with thick end-wall. X 75. 



10. Gametangium with gametes. X 325. 



11. Utricle with filament growing from tip. X 75. 



12. Utricle branching dichotomously. X 75. 



13. Two lateral utricles. X 75. 



