The calcareous alga in question has been described by Mr. 

 A. Elenkin from specimens collected on the Murman coast.^) 

 Mr. Elenkin states that the alga is most nearly approaching to 

 Lithothamnion nodulosum Fosl., and refers to specimens from 

 arctic Norvvay coilected by Dr. Palibin and determined by me. 

 In faet I have determined no such calcareous alga from the area 

 quoted, but certainly from the southern part of the west coast of 

 Norvvay (the neigbourhood of Bergen), This form corresponds, 

 however, in all essentials with L. nodulosum whose typical form 

 occurs in the Trondhjemfjord. Hoping to obtain by way of ex- 

 change a specimen of L. murmanicum so as to be able to com- 

 pare it directly with species nearly connected, I did not go more 

 accurately over the description of the alga. But I thought it likely 

 to be identical with Lithoth. vardoense, because forms of this spe- 

 cies are in habit partly approaching to L. nodulosum in almost 

 the same proportion as L. nodulosum and L. fornicatum are 

 sometimes approaching to one another. As typically developed, 

 however, they are much diverging. 



In another paper^) Mr. Elenkin tries to prove that -L. i^ar^Zo- 

 ense and L. murmanicum are identical, and that the latter name 

 has a priority of claim. I will not here enter on the question of 

 priority. But after going more accurately over the description, I 

 make out — quite the contrary — that the two species mentioned 



1) BuU. Jard. Imp. Bot. St. Petersb. Vol. V. No. 5 & 6. 1905. (Russian with 

 a summary in German). 



2) Trav. Soc. Imp. des Naturalistes de St. Petersb. Vol. XXXVII. Livr. 1. 

 (Russian with a Summary in German). 



