No. 3] REMARKS ON NORTHERN LITHOTHAMNIA. 23 



land (Waghorne!)? 1 ) Ellesmereland, southern coast: Havnefjord 

 (Baumann, Bay, Simmons!); Ellesmereland, east coast: Rice 

 Strait (Simmons!), West Greenland : Upernivik, Proven (Rosen- 

 vinge!) East-Greenland: Heklahavn (Hartz. sec. Rosen vinge!) 

 Spitzbergen: Between Norskoeme and Amsterdamoen (Nils John- 

 sen!); the Kara Sea (Kjellman!). 



b. Subramosa. 

 5. Lithothamnion Soncleri Hauck. 



Meeresalg. (1885), p. 273, t. Ill, fig. 5! Fosl. Norw. Lithoth. (1895), p. 127; 

 Johns, and Hcnsm. Irish. Corall. (1899), p. 29, partim! 2 ) Fosl. Rev. Syst. Surv. 

 Melob. (1900), p. 14; Heydr. Lithoth. Helgol. (1900), p. 77, t. II, fig. 20—22; 

 Batt. Cat. Brit. Alg. (1902), p. 97! De Toni, Syll. Alg. IV (1905), p. 1747. 



at present I possess certain specimens. It is however probable that the 

 alga occurs scattered from Tromso to the north eastern boundary, not 

 unlikely even farther to the south' than Tromso. 



a ) A solitaiy specimen seen from Newfoundland resembling a young P. foe- 

 ciindum bears only a few young conceptacles of sporangia which are a 

 little prominent, one of them being indistinctly concave in the central part. 

 They are, however, only 300 — 350 p- in diameter. Thus the said organs 

 are smaller than usual in P. foecunclum or in P. leave. In this respect the 

 specimens stands nearest to P. Sonderi although the roof of the conceptacles 

 seems to be thicker than in this species. Besides it is not probable that 

 the last named species occurs at Newfoundland. On the other hand the 

 specimen approaches a little Ph. Icevigatum. But the conceptacles being 

 too prominent, and the colour being different, the said specimen most 

 probably belongs either to P. leave or to P. foecundum, most likely to 

 the latter. 



Nor have I seen any certain specimen from more southern parts of 

 North America. A few sterile ones from Wood's Holl, Mass., Eastport, 

 Me. (F a r 1 o w !) and Newport, R. I. (Collins!) I once considered per- 

 haps referable to P. foecundum, but they have proved to be too uncertain, 

 partly also approaching P. Iceve or even Ph. Icevigatum. 



-) I once had for determination the greater part of the calcareous algae ad- 

 mitted in this pamphlet under the genus Lithothamnion. Then, however, 

 many species and their limitation were not yet sufficiently known to me, 

 and most of the specimens were, besides, sterile and bleached. 1, therefore, 

 designated several species as uncertain. On that account I here only admit 

 the species from Ireland where I have now sure proofs of the accuracy 

 of the determination. 



