12 M. FOSLIE, (Schwed. Südpolar-Kx]). 



mostly roundish-flattened. The disc is less overarched than in Lithoph. incrustans. 

 The sporangia are tetrasporic, 60 — lOO u long and 30—50 (/ broad. 



I have formerly mentioned that Litliopk. capitiilatitin HEVDR.'has to be referred 

 to the species in question. It seems to me to have to be considered as a stunted 

 form of the species. On one side it is connected with f. lirciiinscripta, but differs 

 from it by less regulär and often comparativels' thicker crusts partly caused by 

 growing over and covering up extraneous objects, e. g. tubes of Serpulides, and on 

 the other hand it bears a strong resemblance to young or particularly feebly deve- 

 loped specimens of f. typica. Authentic specimens which I have had the opportunity 

 of examining, partly overgrovv Lithoph. dccipieus.. 



L. discoideutn occurs parth' in lagoons in the litoral region, partly in the sub- 

 litoral region, vvhere it descends to a depth of about 14 fathoms. It very often 

 overgrows Lithoph. decipiens, and particularly in the sublitoral region it also occurs 

 associated with I.ithotli. riigosinii, L. granuliferitm and L. magellaniciim. It has 

 been found with ripe sporangia in July and in December. 



Area: Patagonia, f. circiitiiscripta (locality unknown); near the mouth of Rio 

 Grande, f. circumscripta (DUSEN); unknown localit_\- (WILLEMS and ROUSSON); Ob- 

 servatory Island near Staten Island, f. typica and f. circumscripta (SkottsBERG); 

 Falkland Islands: Berkeley Sound, Port Louis, f. typica. Hooker's Point, f. typica 

 and f. coinpacta (SkottsbekG). 



3. Lithophyllum aequabile Fosl. 



Alg. Not. II (1906), p. 22; Lithojjhyllum disioideum f. Eequabilis Fosl. Vidensk. Selsk. 

 Aarsber. (Bot. Sanil.) for 1904 (1905); tab. nostr. 2, fig. 6 — 9. 



When this alga was for the first time met with, brought home from the South 

 Orkneys, I thought it had to be considered as a form of L. discoideiim, with which 

 the small and feebly developed specimens known from the said locality are closely 

 connected. At the sanie time, hovvever, I remarked that the form would perhaps 

 prove to represent an independent species also nearly approaching L. consociatum 

 from the Kerguelen. Afterwards, I have had the opportunit}' of examining a better 

 and richer material, partly brought home by Dr. SKOTTSBERG from South Georgia 

 and from Louis Philip Land, partly by the French Antarctic Expedition Charcot 

 from the Wandel Island (coUected by Br. TURQUlir), and kindl\- sent to me by Mr. 

 F. Hariot. Particularly the specimens from the locality last mentioned show a 

 direction of varying which very nearly approaches L. consociatuui. In treating of 

 the species last named," I have also stated that this species and L. discoideum will 

 perhaps prove to represent forms of one and the same species, corresponding to 



' M. FosLiE. Die Lithothamnien der Gauss-Expedition (in press). 



