11 



Petersbourg specimens from the White Sea; Professor Dr. F. R. 

 Kjellman of Upsala a fragment of what he supposes to be L. 

 fasciculatum Aresch.; Dr. P. Kuckuck of Helgoland several 

 specimens there collected; Dr. Kolderup Rosenvinge of Copen- 

 hagen the species described in his Gronl. Havalg. ; Professor van 

 Tieghem and Mr. P. Hariot of Paris original specimens for 

 comparison from Crouan's collection in Museum d'Histoire Na- 

 turelle; Mr. Geo. Will. Traill of Edinburgh for British specimens ; 

 and to Professor Dr. V. Vittrock of Stockholm for permission 

 to examine the late Professor J. E. Areschoug's herbarium in 

 the Riksmuseum. 



I have previously distributed several Lithothamnia and quoted 

 most of the northern species in Contrib. I and II. As it appears 

 from the following, my apprehension of some of the species or 

 their limits is, however, not the same as then. I want, therefore, 

 to remark that specimens hereafter distributed will be accompanied 

 by a reference to the present paper. 



Trondhjem 27. II. 1895. 



