Contributation. I. 11 



litary specimen of an alga, which I .suppose belongs to the 

 genus Lithophyllum, and not referrible to any known speci- 

 es of the genus. Although it is a rather doubtful one, and 

 the specimen is young and barren, I want to give it a na- 

 me. It grew fastened to Lithothamnion glaciale, and it very 

 much reminds of young specimens of Lithophyllum arcticum 

 K j ell m. Cp. Kariska Hafvets algv. p. 16, t. 1, fig. 1. But 

 according to Kj el lm a n, who has had the kindness to exami- 

 ne it, it cannot be referred to that species. It differs by 

 its thicker crust, being unbranched, and by wanting rid- 

 ges. 



The plant forms incrustations on the host plant. The 

 crust is rather closely adherent to the substratum, 0.75 — 

 1.5 mm. thick, and the surface uneven. The uneveness 

 seems to be caused by the substratum, to which it clings, 

 though not always closely. The circumference is not every- 

 where free ; the free part is 0.5 — 1 mm. thick, and the 

 margin shallowly lobated and somewhat undulated, with 

 distinct subconcentric stripes or feeble ridges. 



The specimen was found in the harbour of Rjelmo in 

 Sydvaranger, on a depth of about 3 — 4 fathoms. 



Gen. Melobesia (Lamour.) Rosan. 

 Melob. p 53; Lamour. Bull. soc. Phil. 1812, sec. Rosan. 1. c. p. 60. 



Melobesia macrocarpa Rosan. 



Melob. p. 74. 

 Descr. Melobesia macrocarpa Rosan 1. c. 

 Fig. „ „ „ 1. c. t. 4, fig. 2—8 et 11—20. 



In the upper part of the sublitoral zone at Kiberg in 

 the neighbourhood of Vardo I found a couple of specimens 

 of a coarse Melobesia, fastened to the stipe of Laminaria 

 hyperborea, which resembles this species. However, they we- 

 j$ sterile and, therefore, the determination is not quite sur§, 



