53 



of the plant, though being here more irregular in size. Heterocysts prove to be rather numerous, 

 and often form grown-in rows. The conceptacles of sporangia, which are the only reproductive 

 organs known, are to be found somewhat scattered in the branches, and often developed in 

 the tips of the latter. They are conical, frequently a little contracted in the middle or upper 

 part, 0,8 — 1 mm. in diameter, when seen from the surface, and they are of about the same 

 height. Their upper part, more or less elongated, gets dissolved at maturity, and then the 

 conceptacles often become very low, looking rather differing from those in development. The 

 sporangia are four-parted and vary between 100 — 160 y.. in length by a breadth of 45 — 60^.. 

 The plant is, in the area in question, furnished with these organs in the months of January, 

 February, June and December, and at the Laccadives it bears ripe sporangia towards the 

 end of July. 



Besides the relation to the species above mentioned, G. laccadivicurn rather approaches 

 to G. frutcsccus f. congesta, and young or somewhat stunted specimens are not easily 

 clistinguished. The branches are however coarser and the conceptacles frequently larger, and 

 as regards structure, the cells, particularly those of the medullary hypothallium, are frequently 

 shorter and more thick-walled than in the latter species. 



Occurrence: Only one specimen has been brought home from the stations 258, 301, 

 311, and from stat. 91 a few ones. 



Area: Indic: The Laccadives. 



6. Goniolithon frutescens Fosl. 



Calc. Alg. Funafuti, p. 9. 

 f. typica Fig. 22; PI. X, hg. 7 — 9. 



Foslie 1. c. ; Lithoth. Mald. and Laccad. p. 468, pi. XXV, fig. 4. 



f. congesta Fosl. PI. X, fig. 10 — 11. 



Lithoth. Mald. and Laccad. p. 468, pi. XXV, fig. 5 — 6. 



f. subtilis Fosl. mscr. PI. X, fig. 12 — 13. 



Branches rather densely crowded, subfastigiate, terete, about 1 mm. thick. 



Stat. 91. Muaras-reef, inner side: East coast of Borneo. Reef. 



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



Sand and coral. 



Stat. 220. Pasir Pandjang, West coast of Binongka. Reef. 



Stat. 225. South of Lucipara-group. Reef. 



Stat. 240. Banda-anchorage. Lithothamnion bank in 18 — 36 m. 



Stat. 261. Elat, West coast of Great Kei Island. Reef. 



Stat. 277. Kulewatti (Sollot) Bay, Dammer Island. Reef. 



The specimens in the Siboga collection of the typical form of this species are partly 

 attached to other hard objects, partly they have detached themselves and continued their 



