132 M. F0SL1E. [1905 



the roof is too thick to represent any form of the latter species. 

 Therefore, the specimen likely represents a Lithoth. keve feebly 

 developed, though it would seem but little probable that this spe- 

 cies occurs so far to the south. 



As formerly mentioned in other papers, the following species 

 recorded by me in Norw. Lithoth do not in fact occur on the- 

 coast of Norway; the determination was based on stunted or 

 sterile specimens : 



Lithothamnion erassum 1. c. p. 31. 

 „ incrustans 1. c. p. 94. 



„ byssoides 1. c. p. 118. 



Pag. 16, 1. 19, for the Azores, read the Canary Islands: 

 Puerto Orotava (Teneriffe). 



