lO M. FOSLIE, (Schwed. Südpolar-Exp. 



Lithophyllum Phil. (Fosl. emend.). 

 I. Lithophyllum ciecipiens Fosl. 



Calc. Alg. Fuegia (1900). p. 71; Lithothaninion decipiens Fosl. On some Lithoth 

 (1897), p. 20. 



f. snbanta7-ctica FoSL. 



Alg. Not. II (1906), p. 18; cfr. tab. nostr. 1, fig. 11, tab. 2, fig. 1 — 2. 



It is hardly to be settled whether L. decipiens and Lithopli. Yendoi, occurring 

 in the Malayan Archipelago, on thc coasts of Japan etc., are belonging to one and 

 the same species er independent. Even more difficult it is at present to draw a line 

 between the difterent forms of /,. decipiens, such as this species occurs on the coast 

 of California, in the West-Indies, and particularly in the western part of the sub- 

 antarctic region. In Alg. Not. 1. c. I have proposed to denominate the Californian 

 form f. tvpica and the West-Indian form f. caribtca. It is possible that these forms 

 will have to be classified as species independent. But 1 do not at present venture 

 to do so. as the material, particularly that from California, is too inconsiderable. ' 



In the subantarctic region the species seems to be of about the same frequenc\- 

 as L. discoideim, though it has not yet been met with at the Falkland Islands, and 

 does not occur so far to the south as the species mentioned. It is almost ahva)-s 

 more or less overgrown by L. discoideuiii, which is more vigorously developed. 

 Like L. discoidetim, it occurs partl)- in the litoral region, partly in the sublitoral 

 one, and descends to a depth of about 14 fathoms. The southern limit as yet known 

 of the form is the South Orkneys, where. however, only specimens feebly developed 

 have been found. 



Area: (f. subantarctic a): Fuegia: Near the mouth of Rio Grande (DUSEN); 

 Observatory Island near Staten Island (Skottsberg); South Orkneys: Scotia Bay 

 (Scottish antarct. K.xp.). 



2. Lithophyllum discoideum Fosl. 



Calc. Alg. Fuegia (1900), p. 73. 

 f. circinnscripta FoSL. 



Alg. Not. II (1906), p. 22; tab. nostr. 2, tig. i. 

 f. tvpica. 



Fosl. Alg. Not. II (1906), p. 22; Lithophyllum fuegianum Keydr. Lithoth. Mus. Paris 

 (1901), p. 5135, TaL XI, Fig. i!; tab. nostr. 2, fig. 2 — 4; cfr. tab. i, fig. 10. 



' Also Lithophyllum pinguiense Hevdk. (in Lithoth. Mus. l'aris 1901, p. 535) I referred (Melob. Arb. 

 Heydr. p. 25) to L. decipiens. I can still tlraw no certain line between theni. but on a later occasion I will 

 treat more particularly of the mutual relations of the said forms. 



