PLATE I. 



Lithothamnion siamense Fosl. f. typica. Fig. i — 2. 



pjcr. |. tile specimen attached to the shell of a mollusc and in part covering a young crust of 



anotlier calcareous alga, tube of a worm and the lower part of a small coral. Stat. 49 . 

 Pig, 2. Fertile specimen in company with a young Squamariacea, Bryozoa and corals. Stat. 64. 



Lithothamnion siamense Fosl. f. pseudoramosa. Fig. 3 — 9. 



3. A net quite certain specimen of this form, apparently forming in part a thin crust over 



another calcareous alga {Lithothamnion sp.), attached to the shell of a mollusc. Stat. 234. 

 Fig. 4 — 9. Specimens in part covering other calcareous algae {Lithothamnion sp.). Stat. 258. 



Lithothamnion bandanum Fosl. Fig. 10. 

 10. Specimen surrounding a conglomerate of sand or stone. Stat. 240. 



Lithothamnion fragilissimum Fosl. Fig. 11 — 16. 



Fig. 11. An almost entire and fertile specimen of the plant, rather burdened with Bryozoa and other 



animals. Stat. 81. 

 Fig. 12 — 16. Fragmentary specimens which are more or less burdened with extraneous objects, particularly 



in the part turning downwards. Stat. 81. 



Lithothamnion prolifer Fosl. Fig. 17 — 20. 



Fig. 17 — 18. Specimens not quite typical and somewhat fragmentary, loosely covering a conglomerate of 



other calcareous algae and animals. Stat. 78. 

 Fig. 19 — 20. Typical specimens in part fragmentary, with irregular prolifications. Stat. 81. 



Lithothamnion sitnidans Fosl. f. crispescens. Fig. 21 — 23. 



21. An intermediate form between f. typica and f. crispescens, however most nearly connected 



with the latter. The specimen is attached to a coral. Stat. 299. 

 Fig. 22. A fertile specimen of the form. Stat. 261. 



27,. A somewhat stunted specimen of the form. Stat. 282. 



Lithothamnion simulans Fosl. f. typica. Fig. 24 — 2;. 



24. A specimen rather closely adherent to the substratum : some hard conglomerate and a young 



Goniolithon Reinboldi, the latter fully covered. Lowest to the right on the figure is to be 



seen a crust of Archaeolithothamnion erythraeum, which also is partly covered with the 



species in question. Stat. 213. 



The plant partly surrounds the branches of a coral, partly expands between the latter. Stat. 213. 



