Plate II. 



Figs. I — 5. Amphiroa aherrans. 

 I and '1. i'ortions of some abijornial branches, magnified ; cylindrical 



proliferations and the spathiilate branches are to be seen. 

 '6. A meridional section of a solitary conceptacle, which is very often found 

 immersed in the top a projected lobe. Zeiss. 4 x BB. 



4. Cross section of an articulas bearing two conceptacles, Zeiss. 4 X BB. 



5. A longitudinal section of a young frond with a geniculum ; a part of 



the frond of a Lithothamnion is deep in the substratum ; the 

 geniculum is perhaps formed of several zones of periclinal cells, but 

 only continuous filaments being observed in the section. Prepared by 

 grinding. Zeiss. 2 x BB. 



Figs. 6 — 8. Cheilosporum anceps, (Kiitz.). 



6. A portion of a conceptaculiferous branch, x Ca. 8. 



7. Meridional section of a projected angle bearing a conceptacle ; the 



periclinal cells are somewhat undulating. Zeiss 2 X BB. 

 S. A diagramatic figure of the cross section of an articulus bearing three 

 concaptacles. x Ca. 7. 



Fig. [K Cheilosparimi anceps, (Kiif;:.). vur. viodesta. 

 A cross section of an articulus for comparison with the typical species, 

 xCa. 7. 



Figs. 10 — 11. Cheilosporum californicuni, {Dene.) f 



10. A portion of branch, x Ca. 8. 



11. Cross section of an articulus. x Ca. 7. Compare with 8 and 9. 



Figs. 12 — 13. CJieilospormn yessoense. 



12. An upper portion of a frond bearing conceptacles in the top of the 



wings. X Ca. 3. 



13. Diagramatic figure of the cross section of an articulus. X Ca. 7. 



Figs. 14 — 15. Cheilosporum yessoense. f. angusta. 



14. A portion of a branch with cenceptecles ; some are immersed in the top 



