its relationship now presumecl to the saicl species suggest itself, the type specimens being very 

 different Cp. fig. 13 and 15. However, in L. Dickiei the more or less plane branch-systems 

 one above the other differ from those in any form of L. erubescens. Besides, in the type specimen 

 the cells are more irregular than in the latter, partly smaller, partly however of about the same 

 size, although as a rule a little broader proportionally to the length. 



The specimen in the collection in hand from stat. 61 is attached to a piece of a coral. 

 In habit it agrees rather well with 

 L. Dickiei, though it is younger and 

 the branch-systems are less plane 

 and the branches in part a little 

 thinner than in the type specimen 

 above mentioned (Fig. 14 A). It is 

 unfortunately sterile, and in regard 

 to structure it almost coincides with 

 L. erubescens, but, on the other hand, 

 it is not likely to be ascribed to 

 the latter. I must at any rate at 

 present consider it to be a iorm of 

 the species in question. The other 

 specimen, which was brought home from stat. 81, is very stunted and bnrdened with several 

 extraneous objects (Fig. 14-5"). As to structure, it coincides even more with L. erubescens than 

 the specimen from stat. 61, but on account of other characters it seems also to have to be 

 referreel to the species in question. It bears a few conceptacles of sporangia not well developed. 



O ecu r re nee: Only one specimen known from each of the stations above quoted. 



Area: South Pacific: Tahiti. 



Fig. 14 Lithothamnion Dickiei l-'o-l. 

 A, stat. 61; B, stat. 81; nat. size. 



9. Lithothamnion erubescens Fosl. Fig. 15 — 16; PI. III, fig. 20. 



New or crit. calc. Alg. p. 9. 



Syn. Lithothamnion mamillare Dickie, ex parte; nee Harv. 



f. haingsisiana A. Web. et Fosl. Fig. 17; PI. III, fig. 1 — 19, 21 — 22. 



Three new Lithoth. p. 4. 



f. subflabellata Fosl. mscr. PI. III, fig. 23 — 25. 



The branch-systems more or less fiabellate, and the branches compressed or subcompressed. 



Stat. 60 and 303. Haingsisi, Samau Island, Timor. Lithothamnion in 3 m. and less. Reef. 

 Stat. 91. Muaras-reef, inner side: East coast of Borneo. Karang Lintang and Pulu Palabangan 



Island. Lithothamnion near the islands. 

 Stat. 93. Pulu Sanguisiapo, Tawi-Tawi Islands, Sulu Archipelago. 12 m. Lithothamnion-bottom. 



Sand and coral. 

 Stat. 149. Fau-anchorage. West coast of Gebé Island. 31 m. Coral. 



