PLATE III. 



Lithothamnion erubescens Fosl. f. haiugsisiana A. Web. et Fosl. Fig. i — 19, 21 — 22. 



Fig. 1 — 11. Young specimens of the plant. Stat. 303. 



Fig. 12 — 16. Older specimens. Stat. 303. 



Fig. ij. Two anastomosing specimens. Stat. 303. 



Fig. iS — 19. Old specimens, the latter a little waterworn in the visible part. This part is turned upwards. 



Stat. 303. 

 Fig. 21 — 22. Specimens rather burdened vvith extraneous objects and therefore rather irregularly deve- 



loped. Stat. 240. 



Lithothamnion erubescens Fosl. f. americana. Fig. 20. 

 Fig. 20. A type specimen, seen from above. Cp. text-fig. 15. Fernando Noronha, Brazil. 



Lithothamnion erubescens Fosl. f. subflabellata. Fig. 23 — 25. 



Fig. 2.3. A specimen forming transition to f. haingsisiana. Stat. 303. 



Fig, 24 — 25. Typical specimens of the form ; one of them attached to a coral. Stat. 240. 



