PLATE VIL 



Archaeolithothamnion Sibogae A. Web. et Fosl. 



Fig. i — 2. Rather young and not quite entire specimens of the plant. Stat. 99. 



Fig. 3 — 7,9 — 12. Partly young, partly older specimens, some of which are rather burdened with extraneous 

 objects, e. g. Bryozoa and sponge-like formations. Stat. 96. 



Fig. 8, 13 — 14. Similar ones. Stat. 99. 



Fig. 15. An old specimen rather burdened with foreign bodies, particularly Bryozoa. Stat. 96. 



I . 16. A specimen partly dead, confluent with a roundish extraneous object and apparently fragments 



of another species, and also in part covered with other extraneous objects. New layers of 

 tissue, here and there issuing from the living parts, expand partially over the dead parts 

 of the plant and the extraneous objects as new crustlike formations. Stat. 99. 



Fig. 17. An old and vigorously developed specimen with thick branches partly owing to covering up 



foreign bodies, particularly Bryozoa. Stat. 96. 



