59 



rather scarcely, and differing from the other perithallic cells. The number of cells in each row 

 generally varies between 6 and 12. They are in general iS — 25 u.. in length by 12 — 15 u.. in 

 breadth. I cannot with certainty explain the nature of these cells-rows. However, they seem 

 to be foundations of sporangia, which from some reason or other have not become further 

 developed. In a horizontal section of a crust these cells are isodiametric and form clusters about 

 100 or tip to about 150 ;j.. in diameter. They occur in greatest number in specimens which 

 are richly furnished with overgrown conceptacles of sporangia, but in some parts of a crust they 

 are quite wanting. Similar formations are to be found in Lithophyllum craspediuvt^ a species 

 which in structure comes rather near to the species in question. Here too they partly appear 

 in great number, partly they are very scarce. 



Some of the specimens in this collection exhibit cells which in part are more regular, more 

 commonly vertically elongated and larger than generally seen in this species. They approach to 

 a form of the species which I have mentioned in Lithoth. Mald. and Laccad. p. 468, but I 

 did not find the difterence to be so important as to allow of classifying it as a separate 

 species or form. 



The plant is in most cases sparingly furnished with sporangia. It has been collected in 

 the months of June and September — December. 



Occur re nee: There have been brought home but a couple of specimens or even 

 solitary specimens from stations 91, 93, 181, 215 and 248. This fact seems to indicate that 

 the plant has been scarce in these places. On the other hand it has apparently occurred in 

 great number at stat. 225. 



A r e a : South Pacific : Tami Island on the north-eastern coast of Xew-Guinea ; Xorth 

 Pacific: Ellice Islands (Funafuti), California (San Diego) ] ) ; Indic: The Maldives and Laccadives, 

 the Mauritius; North Atlantic: West Indies (St. Croix?) '). 



b. Ram o sa. 



2. Lithophyllum Okamurai Fosl. 



Five new calc. Alg. p. 4. 

 f. japonica Fosl. PI. XI, fig. 13 — 19. 



Det Kgl. Norske Vidensk. Selsk. Skrifter 1900, Aarsberetning. 



f. angularis Fosl. PI. XI, fig. 11 — 12. 



Det Kgl. Norske Vidensk. Selsk. Skrifter 1900, Aarsberetning. 



Syn. Lithophyllum cephaloides Heydr. in Ber. der Deutsch. Bot. Gesellsch. 1901, p. 271. 



Stat. 19. Bay of Labuan Tring, West coast of Lombok. 18 — 27 m. River-mud, coral, coralsand. 



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



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



Stat. 99. North Ubian. 16 — 23 m. Lithothamnion bottom. 



1) I am for the present unahle to draw any limit between the type of this species and a specimen in hand from each 

 of these places. 



